Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7fd71722b604da3…

MALICIOUS

PDF

79.2 KB Created: 2021-07-24 00:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e4326cb68f3864fbb69e53f184d05d2 SHA-1: ea6effdf42089c9fa1c24138cc259e6f9305ebe7 SHA-256: b7fd71722b604da3bff945f33e9ecc2c7f6f501525adaa2b760793d6b0a8450a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://aravlicraft.com/cmsCart//upload/file/tajopasanodexak.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2ed3259ac---najelem.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/9da08c9c282a277cff55cd8b9f71b876/56569457928.pdf
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/9323741483.pdf
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/zukovemidirob.pdf
    • http://abwlondonblvd.com/uploads/files/tabawodo.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/edeb376d1ed62b7fd3e66e442ce05085/bebulipiribinudaralijuxi.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/83392392328.pdf
    • http://alpha-cp.com/userfiles/file/zofagamosabomogugur.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0266a34ee3---57694834455.pdf
    • https://pergamine.com/ckfinder/userfiles/files/69245700466.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/2f318966b43612a8b934f71a4d2d9e78/73169009810.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090711757203---68056142589.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e3d4a0d89---nekamibimanu.pdf
    • http://grandbarnettfamily.com/clients/a/a0/a01b80d98e57c38af56892ab55e7d82f/File/12916356509.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/caec84df4410b9964eb28fd9282168cd/jududotimiz.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af27a09d5b6---bofetuzopigepabibulapek.pdf
    • http://biomassasia.net/data_ed/userfiles/file/xizuvikinipiba.pdf
    • https://zevkotodoseme.com/upload/ckfinder/files/18367783726.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/vevovozogikuzetezon.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/7be1aea66590aee173f06ff89cbc453c/kagogozoxiperenuduku.pdf
    • http://www.centralperdana.com/file/35754974071.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec428257b25---dasizonasek.pdf
    • http://rld-carbon.ru/file/vavaxapibumem.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cafa63500---37860525731.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=taurean+nova+1000+roller+door+motor+manual
    • 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_off0000d30a.bin
e173a649d5a671c761a5d426628484e6b393706bebe6484ffe7623d8f5fd1070
pdf-font-stream PDF embedded font (sfnt) at offset 0xD30A 16616 bytes
font_01_sfnt_off0000fe2f.bin
afbabd432cd45a72dec21d384b156f0e8803a4198fdce490ad3b06a1f239f1e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2F 10452 bytes
font_02_sfnt_off000115f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115F4 16792 bytes