Malicious PDF — malware analysis report

Static analysis result for SHA-256 a302d1598ed448b9…

MALICIOUS

PDF

74.0 KB Created: 2021-09-23 11:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5622facfaace9807bfec6260b8e148d5 SHA-1: 7df3398cfd6c881d6ff309df06c00488f0c38438 SHA-256: a302d1598ed448b97b99614e05f9a766a797ff0ad8788f0252213cde998bc1c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to host malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of a visual download button further supports the lure, aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137757e36aaa---14863919730.pdf In PDF document text
    • http://weilandvloeren.nl/fckimages/tasodiganonopesuvori.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16132c3e3546f8---79556542996.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/65579869376.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/daxen.pdfIn PDF document text
    • https://equalland.com/uploads/File/bevimivonevikuw.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/74238225553.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/49741230977.pdfIn PDF document text
    • https://vleek.com/uploads/files/57772993168.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/1731508693.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/17/file/20210917_102457_199.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/jujitojukamewize.pdfIn PDF document text
    • http://th-hl.com///upload/files/84190187113.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ff8a846fc---xabufidasurolik.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8e6e01401---vutule.pdfIn PDF document text
    • https://projetovm.com/uploads/files/mapusurivenuwugido.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///meram.pdfIn PDF document text
    • http://cityfate.com/files/files/72548115647.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/kupesedalobidew.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/tinigegemuzubadetetep.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/20579359333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=gta+v+2020+download+androidPDF link annotation
    • 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_off0000bfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B4 16764 bytes
SHA-256: 5502f86e1c51b7156e6bd12a9cd2cca88b6703d0a87b0d5500285167c6adfde4
font_02_sfnt_off0001033a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 10372 bytes
SHA-256: 0ef2dd2e331c0f987399b7e5856aea89d1e52c74db267cf8acec89ac68b8073f