Malicious PDF — malware analysis report

Static analysis result for SHA-256 387542ea11a48929…

MALICIOUS

PDF

80.5 KB Created: 2021-09-04 00:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 924fbe26d43a0ea529bc226d660a93ff SHA-1: ffff9334b93b4eb203e607ff6fab234db7bbd5e9 SHA-256: 387542ea11a4892996c5967b5c6f7760152d2a95f6ca6822c3145a5a1035e9c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified by ClamAV as 'Pdf.Phishing.Trojan-d2568dad23a94d95'. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to phishing or malware distribution sites, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://odnoklassniki-files.ru/images/uploads/files/zusuvikegofapeparane.pdf In PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/od19io1nmvhkt2kv96sr3oa41l/53023923070.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/medigexekot.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/1022343283.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc43613e2f---luduxelawepiwudab.pdfIn PDF document text
    • https://akconta.com/uploads/files/26394282700.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/gafowido.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/96436775261.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/22122649051.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d18c9a08a61---golalaganofexagezumezu.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/pekizur.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/59533529188.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/60392076813.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210809024402614.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/161256a380945d---21276602780.pdfIn PDF document text
    • http://belloverde.net/emailer/file/vitogakomi.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/1956569148.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/dfhue86irop8l642mjrm4d40o5/50897387146.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc73cc1bea---35644825619.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/wudasedokukototutuj.pdfIn PDF document text
    • http://vce34.ru/attachments/file/63340728344.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/posawawazu.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/66411245217.pdfIn PDF document text
    • http://palami.by/images/file/gowukegetibavaguduzadeg.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efd8e0701c0---nasone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=uses+of+cocoyam+pdfPDF 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_off0000d4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B6 18504 bytes
SHA-256: 587eed562310a21c17c92966241d5ed1fb5cdf7454191caaab874867379bb23f
font_01_sfnt_off000104a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 10460 bytes
SHA-256: b1bfba5c8a036badf206db004680259489bfa86073bbbe05ade878279d7f99f1
font_02_sfnt_off00011c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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