Malicious PDF — malware analysis report

Static analysis result for SHA-256 951245e9ac3d68d6…

MALICIOUS

PDF

91.9 KB Created: 2021-07-05 10:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d71c23d1fc9748cc47830bab81cc228a SHA-1: 24a72d57643cfe5327d19ca66ab24cc4fb7d8500 SHA-256: 951245e9ac3d68d6fe45bb4e293873f318470d65000df6992c176c2b6fdf7c45
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it is a link farm. The PDF contains numerous embedded URIs pointing to various websites, many of which appear to be compromised or disposable, suggesting a phishing or spam campaign. No scripts were extracted, but the overall structure and URI findings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://lumieretvie.com/userfiles/file/79338185053.pdf In PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/83848531786.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cccbcc744c0---tuzikelabazasafizenowes.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/zusada.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c4d56498a---tafomivevejova.pdfPDF link annotation
    • http://www.anieliasfx.com/uploads/textareas/file/numuzusum.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16099e2c219d98---pusarurogovadinazi.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/mumigugowozezijo.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f097262fb6---mupikeroduzeruxufag.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/h40edlvadu2f6veqaiegjl9pf2/41189075628.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e267306be27---sonopewupotegigonirule.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff23238007---16116726742.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/dh2utvagpfspo4ojq43ecnun0n/joremimewafemij.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/c5ce8c933a446fa24c422216eadff2da/vageronuf.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/27051486423.pdfIn PDF document text
    • http://arslanemlak.come/file/mojubuzizirusefijex.pdfIn PDF document text
    • http://artside.org/data/temp/file/85739996970.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/buvesuz.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/54757531403.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb2a77c229---33747174656.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/cf6abbcbe0fd5502c9251bc7c16f9aa0/gasevukewupasepipi.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/s73ikcahkpe5tr88ggg2e2uftj/17729800029.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4821cf8f5---gapegomiwuvuropi.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9f36efa7be9779fa57a3877cbb50c7b5/sekozigirejana.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/xapenol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=quadratic+inequalities+word+problems+with+solutionsPDF 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_off0001044a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C61 11308 bytes
SHA-256: 3f810c4e76e32ccf6c1f8a355920dd62609026938f3ba2165f69dba78f624670
font_02_sfnt_off00013670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13670 16844 bytes
SHA-256: 69a3f0ef9f1dc5a127533fbad7a5ec00acec5977b11f53b47fca8aeed8d48568

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