Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d547a3403703fa6…

MALICIOUS

PDF

83.2 KB Created: 2021-09-22 09:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3fb6e3bfd7754e31ec5b74a45ecb65be SHA-1: 05535e09961b931d8a321e8412445870c0e339a7 SHA-256: 2d547a3403703fa6645457e9dd3012256c0e86dd4bb7124387689a1f9a9cd608
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple links on disposable or compromised hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140373b07394---20306859191.pdf In PDF document text
    • https://vpmemorial.net/images/file/92114806232.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/f519dbe14efae8c340d6ee5fb8306324/40687945855.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/fidobuzok.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/36253748425.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/20312980667.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/15932749048.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/ligabuwowiw.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/52574327306.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/budusozojusogoni.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16149a9b669d31---63013928277.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/gemupesuserew.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614866a26bcd4---42869455982.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/67940397625.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/36568011489.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/67387842529.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/33c65e975ee5b97508d9c2dc9c5ea4e3/xedogizunod.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/pepuruvugu.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/38873193885.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021090511832_456152400.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/53256433409.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/0i75qi1uc9nb67v4j7503a0fdd/94016370513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=badlapur+full+movie+download+720p+worldfree4uPDF 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_off0000dff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF1 17256 bytes
SHA-256: 68077e4521d2d19ce6838242225564a73dd06922ecf05b6e1656d74b24f44c47
font_01_sfnt_off00010cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB9 11068 bytes
SHA-256: ee33263e9069914b2aed5d6394b3ff4a02ca870d01b69993233b78060854e61d
font_02_sfnt_off0001269d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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