Malicious PDF — malware analysis report

Static analysis result for SHA-256 47e6ab137ce2006d…

MALICIOUS

PDF

75.7 KB Created: 2021-08-27 20:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1d2f70f5d5e9f2b9f31c5f0d5133105e SHA-1: 65db70f462e81949d26c6c7249912458c53e99ca SHA-256: 47e6ab137ce2006d8d9f8caab0c0ec82b6d5a065c2ec6041eee2cea7cc9e0cc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://queure.ru/uplcv?utm_term=minecraft+cute+images PDF link annotation
    • http://autoscuolavalerio.it/userfiles/files/17371274845.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160995caf9b72d---36534948761.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/aq4j1ci8nhsjc0avva5rg7j19a/rabunigi.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6950da1c9e---32596400381.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/2510819701.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa3def52a---xidezulawo.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/72588767431.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/voroxarinewejad.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/59475502797.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa2ff0d6ae---fegutujab.pdfIn PDF document text
    • http://medica-brno.com/files/17890134640.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/zakuxepijimin.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/9741072564.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/kuguwisosob.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4df017bb07245d042c894ab9a041f9f7/pegipeliraminar.pdfIn PDF document text
    • https://datajournonepal.org/files/49913906474.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d62cfd29b0---98695347754.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/bitisekiror.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/82592670403.pdfIn PDF document text
    • http://momsystem.ru/public/file/30469936810.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/luxipivorasodanox.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607482f97882b---22715993340.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/pesoxitidiminonetab.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/727eeee32f8fa06fd5f2bb976abbcd8a/95294558466.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/oiqastagv0gth52692pu0peh9r/14162297607.pdfIn PDF document text
    • 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_off0000c42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42D 10604 bytes
SHA-256: a0dbd1e615ac2e8255435f406c4bd76ad4c93aee36597b2ca256a35e69c705b3
font_01_sfnt_off0000dc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 16748 bytes
SHA-256: 21781a8262147105de210b19858dfd199d5602d0e8b0e007836d0a9d88f2f266

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