Malicious PDF — malware analysis report

Static analysis result for SHA-256 7031f2680ab3fef6…

MALICIOUS

PDF

73.5 KB Created: 2021-09-17 09:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b2ad31e92acbb9aef63feb7a8765b3cd SHA-1: 959f924e53ef7a90ff76ba6cab1ac2d857e76a7a SHA-256: 7031f2680ab3fef60ea96a702ef4641c18c023e69db8557bfe89c246b1253293
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is part of a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=music+player+by+lark+player PDF link annotation
    • http://straps.by/ckfinder/userfiles/files/kiwovilejazujazimonuweji.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/34140405674.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///92526427018.pdfIn PDF document text
    • http://askaudit.ru/price/46541077777.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/desiwowuredoremutifanuras.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314a3dacb90---bodibitemukadefowedajowes.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/zurekibonuzo.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/33513720277.pdfIn PDF document text
    • http://oilspecchem.com/files/tolovevuzasetiku.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/28457079596.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/71627144150.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/joxifowizofu.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/43761116293.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/93551008845.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/31922267948.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/89657391433.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/sexepak.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613272a2dbfdf---17959564395.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/wepora.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/2491640329.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c070a65b7---wogegujabuvap.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/4914913155.pdfIn PDF document text
    • https://2winit.com/Files/files/sumegimavuselitavexixagi.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/jakufutopirog.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/ripotelojegezuzogafeda.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_off0000bf4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75D 16136 bytes
SHA-256: da35ac87390befad064cc9d78d1f36a3872efadd35a0d7bcc65a35606824f7d5
font_02_sfnt_off0001004d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 10484 bytes
SHA-256: 8587da7b3878ea8d0152a01629c25e3d4c54f5e8980171380cd15c53a76dd9fc

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