Malicious PDF — malware analysis report

Static analysis result for SHA-256 840e8525274cccd3…

MALICIOUS

PDF

78.2 KB Created: 2021-09-04 14:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 08e166d6b9b785a5833a7ebf9ee731c3 SHA-1: ae6c0a293c4b8c4cd0380559f14b94fdff46a604 SHA-256: 840e8525274cccd34f62506b85f9d34116f3cd1251bf2a8fcaa038ca11109609
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and malware detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://irlanc.ru/uplcv?utm_term=cask+of+amontillado+worksheets+pdf PDF link annotation
    • http://szentimresiklos.hu/upload/file/60073091484.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/xugetimarafe.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/mopuxuzif.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/73008170076.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/zokodiwevepateko.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/lusen.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/kcnb1fgs59aiaqp2s2d6l108oq/sudobeketazozekade.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/59184917743.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/h93b10nf3lbi1jjdsp6rq3gea1/sotufarujoxok.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/sudideruno.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/61gajkhoip73bvcpqnpu3bu1e2/81994017294.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/de81b816280676dab8797953e560e3e6/wogexudigev.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/miselosoxakazojitamil.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6f36d55b3d6b45da8dbc54b737e291b2/jusisaxelujegemisezate.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/lumorefonanenizin.pdfIn PDF document text
    • http://dentherapia.hu/files/file/64575869123.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b79610bc---ginupugotazopotogivipod.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/11814036512.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883b8c25c11---tixeza.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609282d39642a---52023469489.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/cb8825df0fc067679203e78202b6ebdd/tipemo.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/3665291821.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/21747388581.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_off0000ccb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB3 17268 bytes
SHA-256: a57f58193b38e3033d8db6dbb6bbd88b27c65aca2a8ada6eada31cfcb83de9bd
font_01_sfnt_off0000f9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BC 10972 bytes
SHA-256: 048330f641deeb572cd80214e60f6538281c4c9e933476acfe2bc1a84337a3b6
font_02_sfnt_off00011314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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