Malicious PDF — malware analysis report

Static analysis result for SHA-256 448d2d171269c2a1…

MALICIOUS

PDF

113.0 KB Created: 2021-08-06 17:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db3ca48143d9a450226c6a2253b8ea27 SHA-1: 4c92bd878754e3cf2af9c6184782339623245128 SHA-256: 448d2d171269c2a12bcaa7505f4888598616720b14dd98cbaa330d488a924f4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9830

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://infrive.ru/uplcv?utm_term=how+to+teach+finite+and+nonfinite+verbs
    • http://gleneaglehoa.org/images/file/82742171815.pdf
    • http://anaminfo.com/attachfile/file/zuzowoxemorasel.pdf
    • http://mea-travel.pl/userfiles/file/waxazej.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad057fa74e6---95585345101.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cda7658ee3c---jekevosigoripo.pdf
    • http://cuatro-pr.org/sites/default/files/file/bosajo.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/024bb09f240daf4234a684a1bfaf06c6/suvonuru.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/969934d30b54c896dd649279542a6d86/zudizowime.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/bueqihk7sgpijqmjl6ptoo38na/gutoguxumaxil.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ev5qi5fek1fhbsosg499pavsq4/bemobidojotixejo.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd09d79cd15---dudizadebobasutelaluvu.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607495656a344---7031910274.pdf
    • https://fallahi-sch.com/userfiles/file/titabiditesebizakelupete.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/a4151879536dac772ee17029c64ccf61/37846750988.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1066408a5---94995283692.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a023f148d5---vavuduzikexijimajix.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a22e3f4879c---lovazave.pdf
    • http://jyotiacademicpress.org/uploads/file/biranaka.pdf
    • https://signika.pl/Upload/file/depapok.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7222b8a281---94589459126.pdf
    • https://dadrarad.ro/userfiles/file/sowunalenaxotog.pdf
    • http://barcabianca.eu/upload/file/75098467431.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/lh6trdm51jpuunifb1ff2g99am/vanunofinerajakot.pdf
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/sobakuzumura.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/9efi0mu922fakc1pjtrk1cmo5j/84143785672.pdf
    • http://easyreturn.store/userfiles/file/zoxufi.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbed81df902---lerewazuda.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ae1.bin
c215728d36cbd35899fef483c8f0ea207e00246be70feb8427a2044f8924688f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE1 10812 bytes
font_01_sfnt_off000153c5.bin
5634b4844babe69053429d4d51dca097b433c24b06ab1676b3a7eeaa013af885		 pdf-font-stream PDF embedded font (sfnt) at offset 0x153C5 17524 bytes
font_02_sfnt_off00018087.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18087 16792 bytes
font_03_sfnt_off00019898.bin
d64864dd0dd8721386482a900ccf34ac279ec08b1f2b0be3f76ca6b8447c6f39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19898 17624 bytes

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