Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d01d736353687cb…

MALICIOUS

PDF

90.9 KB Created: 2021-06-25 18:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a1ac9e4d1b4cac94f9f29c5217eaa3d SHA-1: 8a6058b7c5e8bbe8a1c9d7972aa747c8ebc7b057 SHA-256: 5d01d736353687cb501b37c8916ab6fdd11f2b0387b0956ad2e910a13bd971eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, with numerous embedded URLs. The primary purpose appears to be directing users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=lie+down+on+my+bed
    • http://bebelino.ru/userfiles/file/tuweg.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/8e6l66v8v8vhh1ocijkgv1mlk2/78291886181.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c064451f00---99521359263.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/be37ed94edd00b76ae364c3eac624834/48065261764.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/7b0753b42af02a547909688351d6e796/99572092615.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16070e59472163---5104507902.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608011761b9ee---xozotutesuxabonije.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b56033685ae---55960143665.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608066c9c23c8---gajerokavesezipuzorivazib.pdf
    • http://peaktoppet.com/ck_imgs/files/69454717847.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/c80j4pr0ngmprrj04abvvf9342/19548706534.pdf
    • http://teraval.cz/res/file/votowurumudenoxomodekituj.pdf
    • http://www.sport-konyv.hu/userfiles/file/35283435808.pdf
    • http://animationcoach.com/userfiles/file/balunajivirireduva.pdf
    • http://kipia-nn.ru/userfiles/file/88563130128.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea713ef95c---7068967092.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/gofolotojikujidivu.pdf
    • https://vegan-eshop.cz/data/file/mibaranotidapixubo.pdf
    • https://hgb.se/filer/file/69436506630.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf9b0308f2---wemoduzevuja.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/aok1m1t6dk8n3i7uo616c4vi0s/vajabemobokopudip.pdf
    • https://aimhc.com/userfiles/file/98775157879.pdf
    • http://burattinojatek.hu/userfiles/file/buvigonujek.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8f340e3ceec3f13e7892bf811b7426ef/wigenutumaneruwokexafot.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825a759adb8---48146691722.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010178.bin
393c6463578285abd37420ee8564a06ed749132c27ea07af70456e6f99193f41
pdf-font-stream PDF embedded font (sfnt) at offset 0x10178 10132 bytes
font_01_sfnt_off00011814.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11814 16792 bytes
font_02_sfnt_off00013026.bin
e129be0fac45ae7af9d67ea41d849c3824fd55929971152cba1b98122abcede0
pdf-font-stream PDF embedded font (sfnt) at offset 0x13026 18032 bytes