Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4627cd3f22c15f…

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 14:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 51371c86fd78d15a00e0adfc3b65eaf6 SHA-1: ad4969bb1fdbca6e29f65bf6d4dd463911dbb66c SHA-256: ab4627cd3f22c15f2db37f28f25d94be4e2c4bb4b4d1ed2c4dc579f5ffdd1243
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://ketchas.ru/uplcv?utm_term=ugc+net+commerce+question+paper+pdf+download PDF link annotation
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876c2f659e2---31783964143.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/lupifubobowenafiz.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210727/210727210346381496xx5sdonpw5hd.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a602193f71e---kekujezozasar.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/nixusukuvak.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/vebopapega.pdfIn PDF document text
    • http://hydrem.ru/images/file/66451871151.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/75351002224.pdfIn PDF document text
    • http://serting.eu/userfiles/files/rufumitonori.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/4202317296.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/bevone.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/12887356036.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/90303723331.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfd1a975d8---wulevaziwinu.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771cf6558a1---44028603243.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/dimukugafumatazubu.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/beravuzifasugugigoxeze.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c450e04eb63---kegagapimitedosevunimug.pdfIn PDF document text
    • http://garderoba.sk/images/_file/lazad.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f302f738e0e---86954148270.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e486049678a592e3fe7640069838d679/59364098349.pdfIn PDF document text
    • http://vitaminyplus.eu/files/file/20425213856.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/parututid.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/vavepabal.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/mewunafad.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_off0000cc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC59 18040 bytes
SHA-256: 6bffe8c1b2c839062fb386f750c40534b81d4cadf4f533195e7574627c2823d7
font_01_sfnt_off0000faee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11305 11300 bytes
SHA-256: 041d8f937e5c79f65c03fd37561acfe75db4d1768d2e883c21061016901c6002

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