Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75b01f39eb94233…

MALICIOUS

PDF

74.7 KB Created: 2021-09-01 10:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 72daf0c1082451507d91621fd15a7d5a SHA-1: 6b061bcf062721d95a857ca2e6c4ac9d33751f01 SHA-256: f75b01f39eb94233e7ffb68aab784cdb118b2c1ac36c218a256dfe433628f600
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to obscure the ultimate destination, likely a phishing page or malware download. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://archism.ru/uplcv?utm_term=another+word+for+babble PDF link annotation
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/4aqggai21j0ualdc2bgid7to0k/gugisidonewetiputuvafa.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16072dfd085145---puveduzojusomuxudimero.pdfPDF link annotation
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd46d08049a---67578234527.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098805764403---fomixixawemoxutugevo.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dea48983da---dovikupaxikupel.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/4627844041.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/juxixofapiza.pdfIn PDF document text
    • https://parfumzone.ro/files/file/sazoliremonekex.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/7159b01383e78cdf58bbf690eed00937/90585535526.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160be84abd8807---72804718406.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/40822d238b708f52d5dd54284ff8fd47/guzuxewi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110aa1fbb095---dofelepujamirujafiwov.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d30dce07e81---vulinolof.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f846b0562---99213892708.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/c6a737j705o9qi6r0qccbs2p5v/33560432731.pdfIn PDF document text
    • http://emannsltd.com/userfiles/rodusiratawuno.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/57212822376.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/40d66024fae9cbbff0137ea7a6f49125/viweturasupekakas.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/80561700567.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/79499650409.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/52261798726.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/35512646.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160927bfe29fc1---redotepigi.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/xixeberajefifizoferelutu.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160871ccc5956d---65459842987.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_off0000c3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D7 16100 bytes
SHA-256: 5c0687fab97f4057adee9e98105ffcbee06e660ee4b559ded8047916c8fc2658
font_01_sfnt_off0000eccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCF 10396 bytes
SHA-256: b62e310924f3fb85bcbe10d850df297dfadc3e345bfdbb6613aa000428d5538b
font_02_sfnt_off00010459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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