Malicious PDF — malware analysis report

Static analysis result for SHA-256 d69e42590cae40fd…

MALICIOUS

PDF

79.7 KB Created: 2021-07-10 12:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b18aaacebc50c19f190793d505faaf11 SHA-1: bc64e4fe4fecbe0a0da32753036f2f5232e873d8 SHA-256: d69e42590cae40fd13ab8af317aeb90ae4141fe6113480a03fd7cb67333dec95
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0', and an ML classifier also flagged it as malicious. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9so0qknmlrr1atn6jg5kv49dj7/10058782274.pdf
    • http://absolutelyneon.com/userfiles/file/pevajufolakidal.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/lfv871ihcda4e2d3ir89s0v7cr/wumugana.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160706f1b05cf3---dixofov.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b301637cf2b---kevopadufeb.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/tilesu.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/3277e1e6769bf1bbcd0011ef10f58917/vefamo.pdf
    • http://surmounttravel.com/userfiles/files/880247592.pdf
    • http://hyosangjo.com/userfiles/file/20210618122233.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160832c35ab807---zorabufemepobakobamo.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c3c516b4---xamesizagakofamakometipo.pdf
    • https://alakharia.com/public_html/userfiles/file/bexenof.pdf
    • http://kocavietnam.com/upload/files/44786428261.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/6c1a5c281b19bfc3a2f407e34fc45e07/70529492487.pdf
    • http://xn--80aikni6a0b.xn--p1ai/images/file/radipujinemazo.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c87fc3bedc5---79883188695.pdf
    • http://chono.mn/uploads/userfiles/files/61052199046.pdf
    • http://jtour.vn/userfiles/file/pevulasawipivasumis.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b318e41d4---43299230853.pdf
    • https://agrilaui.com/userfiles/file/fixuwiwavap.pdf
    • http://hiddenforrest.net/clients/76790/File/55679360638.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd3f345e3c---makuroxurujolidoxomopofi.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/bbe2593e303e4656dbb899d1e3d8c3aa/57798656795.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51b699c5bd---11932456834.pdf
    • http://a-kamen.com/userfiles/file/72519285371.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/f0aee832538eb1f31832dd297bde0471/80737387145.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=spore+apk+android+download
    • 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_off0000d61d.bin
475c15ad88d9d955cb396e1fed1fe61d591f4e3bcb0202589e32a84558b1966b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD61D 10372 bytes
font_01_sfnt_off0000edaa.bin
bf538ab15f0384ec13d29b40dd083edb59fe31fb9423dc679421556365f76b84
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 17308 bytes
font_02_sfnt_off00011987.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11987 16792 bytes