Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd7abe8cd0b9113…

MALICIOUS

PDF

113.4 KB Created: 2021-06-26 03:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ae717a0d6b07653b4ed978f4881efd16 SHA-1: ffa65ce25ffe015f503335c25e6016cf7f5d6f1d SHA-256: 8bd7abe8cd0b91130c1194ef695c7f9a898886a5ccf92080f25c208fc117b8d2
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories. Heuristics indicate this is a link farm on disposable hosting, designed to redirect users to other malicious PDFs. ClamAV detection and ML classification confirm its malicious nature, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/b6efngslnkrob9trgo6m8uq3jn/lexoxowisabosalet.pdf In PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/4389932049.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/ssv4js2v0f3cmnfv5n8kvokr0v/zovewofotosezawamawinad.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/54399396154.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/kunibaxodejusijumej.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/25a96ce3c126943bec331f858ab6b47d/kixejogixupuroduzikipul.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///larewo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc93e900bf5---4073395262.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/hisr204utt0gh33t4ukovqfk1q/fufeweximotedopade.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/us7sbavf7ap3i11vgdnc5ud8c2/xurepufu.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/punewusoxedizi.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/folimonizujiralikuva.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609186859c16e---19436658212.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092ec6851a19---14351980006.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/1d0c1dbe173017e1af3ffce87b441fb2/felisegawupetolovefuxedex.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9l86sk0oftf75eb83r12tig35u/gigexekamavorurepakovonar.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/vij8q00u8lbucfv4furutkrqml/xefikuwiwuzawuvubega.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/xitorugomizanuxudusiv.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/fezitisumike.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/98959570376.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/27383502398.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/rewerasomibujage.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d1d519052---mafotumojowusavaxadujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=made+easy+resumptionPDF 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_off000159c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C2 17536 bytes
SHA-256: b83530161fe0a19bf3594ed16cb6735c9eec7af28a59b66d8c78d5b8fbf6c5f9
font_01_sfnt_off0001879f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1879F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FB6 10716 bytes
SHA-256: 1ed75a0a632e18e80a29fd98e2252a2abf029db2f916e214849525734e08f705

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