Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8597dc65228a54…

MALICIOUS

PDF

92.1 KB Created: 2021-06-30 03:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02465da72e09eca28472796142477d1d SHA-1: b14624dc7f06b2c03bbcce4f106c4c12bc469f37 SHA-256: ef8597dc65228a5433cc4896975e6a3a6f5e07d3a3a0758a2e718330bd6705b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a phishing lure, indicated by the 'SE_INVOICE_LURE' heuristic. It contains numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the download and execution of a second-stage payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • 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
  • 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://krisoc.ru/uplcv?utm_term=pre+app+electrical PDF link annotation
    • http://pogotowienaukowe.com/Upload/file/74450685523.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/pepubekuxuzavokamenobe.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/muketiposoda.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160988c745b2a6---7238768695.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/rfst8qtfngv21fln80k1gj827d/2420305744.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/puzotatetumuvexir.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5146868469681c150852b9ceaa164461/xudemeximas.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/karurunifavikisutom.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/9c193a490fc5e36554a9c47f2fd5c4cb/29618238277.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a16bbb07453---93475461049.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b339d31c022---32575532249.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/96e2e6c31fb1a8fbad0ae7ca4fab7a1b/gipodukukulipivol.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cf924ab7b---74809153046.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/9d4fd8528af485d758bfce40d4eebbc0/xujoxubadizuz.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/2668996164cc34fc2e77cbf72e9a05c0/68404822312.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd6fe9eb21---kabetewoxaxiwopewex.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/250241414881.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/bowapinifokogulaniderad.pdfIn PDF document text
    • https://atrax.hr/files/tedamosiduvinazufaxidugu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5be46dcdda222eb19595efdc8a939565/2917126687.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/m7vk2f77fn38rfuoqir10880g9/taxadov.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac843a818d3---82981773327.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe340ae0d0---tatox.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606faf22898ce---xazikopa.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/25343227917.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/nisovubigiwudasanez.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_off00010238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 9976 bytes
SHA-256: 2bde691d8218c24857f65aff761fb257368fc039d3b077df5a87c688bca04918
font_01_sfnt_off00011865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11865 19628 bytes
SHA-256: 28ced5899e67f6190fb128ace2a652e2e0197f734fff0fee9316ddd4ae2d7896
font_02_sfnt_off00014af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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