Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afe97306751742d…

MALICIOUS

PDF

70.5 KB Created: 2021-09-04 18:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 62b37bc80db6cb7e2eeed60c6a8c3d80 SHA-1: d259c788270ec51fd3a741e50277006a82ea777a SHA-256: 9afe97306751742dac692f2e8d21e089c9fff3372ca70c82614274f9e4b0bf8c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6394258e---mupujok.pdf In PDF document text
    • http://www.aluvascientific.com/UserFiles/file/81053160478.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7268ac3f1---86245459469.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cca3a5aec52---dinuwafaxilozinapivu.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/tesabogegotisapotusedezu.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/59157226584.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/rotifopuzavep.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/593663046.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/vomevevatuwizawilimilefaz.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021626858169722.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/lasiwebidodoja.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/eur4rf43v41mlqnd060hdedgoh/fudararozamelaxopubewiren.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/86799262945.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083a179ab2af---torasajupolelakomifisipu.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/pazejime.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40db1c5a2b---13041771834.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/wogufetukokanefami.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608996228b2f3---lokovidavokot.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160726dcb003ad---sibupudoxudunuxu.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ktfjbj065r8acvp2huqg2ao7ga/juxoneliwupavuwitiwomudof.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/75540533218.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/kivevi.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/99364274709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pengertian+sindrom+nefrotik+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_off0000b577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB577 15200 bytes
SHA-256: 7e3c74f6493757c5e7a7b20d330891f45bc9c3936993bed07afc459352d22630
font_01_sfnt_off0000db4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF366 10888 bytes
SHA-256: 60e6522ebec0070c7175c9d361a64fbfb06af2af2dfadb6417f47c726787f971

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