Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac478c1ff19b67a…

MALICIOUS

PDF

89.5 KB Created: 2021-07-19 13:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad34d311bebbf06b2010d45c15b43d73 SHA-1: 1553197323ec4553d0a383d5689490422fa3809e SHA-256: cac478c1ff19b67aa1e7595cc8c1ab99980dc4fedc5aefadcf4692f26ae23a3b
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 numerous URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary function appears to be redirecting users through a series of links, some of which are hosted on disposable domains, to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b282238bcc---61204145105.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/rugofukosew.pdf
    • http://kaztelcom.kz/ckfinder/userfiles/files/nosiferaxinopokuwepi.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccafc4fa72---nifuzuji.pdf
    • https://girilawfirm.com/content_files/files/60617472774.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994478d8b79---disututukewobi.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/bessvilu3vichiereqnamlucc0/lapesipudetepe.pdf
    • https://rsun.pro/admin/ckfinder/userfiles/files/39295985935.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1424d17ea---dajogefasolem.pdf
    • http://banquat.com/userfiles/files/pufepirole.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160941eca725ed---36200491154.pdf
    • http://henrysadiereunions.com/clients/876463/File/tuwofewikediwawigudegax.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/c574ab968c446c5ab5cd00222e740b46/18067355969.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/714b017be344653f7b3998bd453e28ef/fazawufareweva.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/1907935c21d8539c1c977d818f4c6398/zurobikumiz.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/9898012638.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/d5vd6qp692e70283jpnvjopp81/36924812736.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd157cb3d7---41776359734.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/xigigituretufiguzefofokos.pdf
    • http://lottfamilyreunion.com/clients/878857/File/xukojefose.pdf
    • https://bbpartner.cz/userfiles/file/noxozuduvid.pdf
    • http://klimatyzacjaradom.pl/userfiles/file/zuwudos.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=take+advantage+of+crossword+clue+7+letters
    • 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_off0000f7e4.bin
f4d921b1ea3276f52845aba9117ae88c10e97bc22d478fbf2a8dfe1615352829
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E4 17880 bytes
font_01_sfnt_off00012741.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12741 16792 bytes
font_02_sfnt_off00013f58.bin
c9d17be74372cfe99c088987802d97a42607cfdf0370a8724428dd01bb4f8f46
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F58 10916 bytes