Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45da318baadcfe6…

MALICIOUS

PDF

87.0 KB Created: 2021-08-30 16:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2a430115670229ea70de853645fae2bc SHA-1: 5f9816af91270093277c7c09a52c5e3c822ef5b0 SHA-256: f45da318baadcfe65ee8844726b5fb55f4c88b52b07f3be0c641d9e74443acab
232 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It presents deceptive content related to invoices and remote support, aiming to trick users into downloading further malicious content hosted on compromised domains. The presence of multiple external links and the use of compromised CMS upload directories strongly suggest an attempt to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2c1cf65846c59755a673a9ba766214fe/11638167266.pdf In PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700669371b2---29818380388.pdfIn PDF document text
    • https://curvy.tw/upload/files/1759821967.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/jk20e1nu8c15ga130iop7mse3s/wugekagonumimamodupid.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/45893214160.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e328f437a7---xipemunemefosupe.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/43243390405.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c23dd8da5a---75866806148.pdfIn PDF document text
    • http://web68s.com/upload/files/79360762999.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/20489375006.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/vijowetikorojiterubiditot.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d22602e83fd---55832536891.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c3d7d1f4202---ribiboxe.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/32600238627.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/ii26u51odur909r39a78h52pt1/gewile.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/movowopokadanap.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/86363133554.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/76259371681.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0946cbce2b---96572703054.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/belinomolukuf.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021082205544273499.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/gusorimebamozomiwazodu.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160939fa11e821---74210895419.pdfIn PDF document text
    • http://domplus.su/userfiles/files/zekijul.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/80320369964.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160d09b238ffbb---begeruxugotuduruve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=chris+brown+ft+usher+gucci+mane+party+mp3+downloadPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/71828273915.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D8 11712 bytes
SHA-256: 15322377c5925d6b9ab0a61ea2b0263308dbed6413807fe2239bb40658b68f21
font_02_sfnt_off00011d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D49 18264 bytes
SHA-256: 82b9ff7ee0b36c5e91665e3f8c8a5e8394c6b7da58a5abffcdb76e4b4ab11579