Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cad62d585ee5ab5…

MALICIOUS

PDF

83.6 KB Created: 2021-06-28 03:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 281ee0e7d804d1823a8a122d904da888 SHA-1: eb9a9264c82392e8c7740c28bbec012e17e156a4 SHA-256: 5cad62d585ee5ab5c6a774df408f1a2f3efee1fbf3517d85fcaaf46cf8323f79
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised WordPress sites. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160baa59af0722---95155001947.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f5f9c44a7---85902757474.pdf
    • https://mujeresenmovimientoplus.com/userfiles/file/mesamimav.pdf
    • http://thingsantiquesla.com/userfiles/files/vegodaniwoj.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b55d55e1995---55584635237.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8708db1b83---nadonewixonu.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6107dda965---faralekilaxol.pdf
    • http://balone.net/_upload/file///panolatutujakijejamalajom.pdf
    • http://www.malagatour.es/ckfinder/userfiles/files/wirefitek.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/41679004427.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac95da9c167---47299340404.pdf
    • http://doks-films.com/pcms/content/file/91724100998.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/34be7eb1b9a9bf7394fca37e79f7faf3/nologuxumowizizotiretave.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609021b8f338a---4935252513.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe00974606---pobebewolokesesad.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efbf8801c3---7183679416.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160984206e4257---zejiparejedijome.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079e2b31bfec---vixuwatixerutigegutex.pdf
    • http://galeriejacqueselbaz.com/userfiles/file/45337306246.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/31574ae40b01f9bc095ee432e2e361da/kotikinupopazobikino.pdf
    • http://www.deco-interieure.com/userfiles/file/vujazododevaxazonarom.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/397384d5c6111cd652c4e1f73165256b/36903877826.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c506a362263---simirijerilojun.pdf
    • http://bilmatbasim.com/userfiles/file/faxud.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=columbia+county+recycle+center
    • 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_off0000e473.bin
fd0409880c6a9333c3d9afd017ae485dba4fdd4211b9775e74133f0af23c3609
pdf-font-stream PDF embedded font (sfnt) at offset 0xE473 10608 bytes
font_01_sfnt_off0000fcbb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 16792 bytes
font_02_sfnt_off000114cd.bin
86da6fa99c6f7277ef6d74cb8ca379662da06faed0590ab207695228521ab29c
pdf-font-stream PDF embedded font (sfnt) at offset 0x114CD 16864 bytes