Malicious PDF — malware analysis report

Static analysis result for SHA-256 a916852a85d960ef…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 21:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6323077c6b3d0d360db18c2735c7df5f SHA-1: 2a3b2d898b06bfe46ff4c9b83ddd06b3f3e8c349 SHA-256: a916852a85d960efb5b0cb9d58fb1c7a30cdb10b026e57a6b488ba758b128bac
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS platforms or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, but the URL heuristics are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://superfishinglewood.com/uploads/files/mujike.pdf In PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b67f8ec4d---tedejedawilebip.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/99836322909.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366c3926c8e---33914443823.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/46869160302.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/nefim.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/zeviziwuwokewamifokuk.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131331b195b0---tevevabajunekaxef.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/xajivojivomepasodunit.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/matokilajojagano.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/95338591633.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/51355978334.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210902033102.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614827486cf3a---26969270993.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/sirutikivibobixapaturodap.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/manizipifaxozul.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/86992820522.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/74987120275.pdfIn PDF document text
    • http://yztools.com/images/upload/File/xuwozijupixu.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/famolenonilanavigaparaf.pdfIn PDF document text
    • http://texmet.pl/userimages/file/xozixujosunudogopajozete.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/lalavafeberalog.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/97467546759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+browser+keeps+closingPDF 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_off0000db0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0E 10728 bytes
SHA-256: d80cb1856fb22236dc529bb374c5e91f6d64ac43c4c26b73be1557b0f9c06fc5
font_01_sfnt_off0000f36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36C 17636 bytes
SHA-256: 31a8ad6c70411d9b4f9db55f2644f50ea2eaf56a6030151202d701a371e47462
font_02_sfnt_off0001211d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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