Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbcbee80bd3bbe8…

MALICIOUS

PDF

148.2 KB Created: 2021-06-29 00:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 116a4a78253523d59e864ba9c25ec06e SHA-1: f7cf6148e74ed7345c673f34ddee6a7c0b392692 SHA-256: 8dbcbee80bd3bbe877236bd63f23fcc1de4879f93e59e603032e3c4c70fd7694
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of multiple distinct hosts and a high number of links per host indicates a coordinated effort to distribute malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/bdb4272a2a670a1c8a14021b873f0720/18456311814.pdf In PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160865347ea25a---relasagiwijaforexe.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/c56d5f67210516be541fda59ddfe1766/mubomoxexajup.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606dff98ac660---ponumazulepuvewab.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/72212494884.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/76386182407.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/mopizudulep.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e145e6d56d---61553548486.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/86564569532.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/0m2l4mjevacbra796bceisiu4a/75025951390.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/d31e471ce6bdc9f1f2b4567e8e0023fa/37132191778.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/35rrkvvglhs5ehaa6s57c5hij6/dujekibupesuma.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/pohocec4211pfstn7qhb1ere37/96283047621.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/8f8cb2acocb62qdh0d2cd4llc2/linakagejusulezuzu.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/78096683497.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/51544798258.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/25ea4411997287c6fb9e8404e615c35f/tifiparep.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/zekokepibos.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/8k63g7727pqelv5npclbqt57p6/fadimozif.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/mezotirurigizup.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/m2go6mrptekgmd8rc00ak58sk3/dasavotuzowinigosupobopek.pdfIn PDF document text
    • http://mosjob.ru/images/file/32472584215.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/xorud.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/75461451673.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79bb7175cc---visegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ganymede+is+the+moon+of+which+planetPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ee7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE7A 21856 bytes
SHA-256: 210621914c410deccf6e9b236f2904ed284d7b5a947fd933a3d70765499eda36
font_02_sfnt_off0002278c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2278C 11024 bytes
SHA-256: ba506a689478f71aa28327588ca6c6df909df926aebe70ad2d63dab84c3734f0