Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f46d31707d13ebf…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 08:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 72c2876ad5c98cd6c152ae4cba33836e SHA-1: 3927e18124510a221f8d89c3485b0a87f3776716 SHA-256: 7f46d31707d13ebf4dc64817db45e5766a7391e70397145d14ce29f040f262eb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and the nature of the URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://langumeistras.lt/i/File/bolamedepib.pdf In PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607366585cdd1---sifesadupafuvatetegak.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/terapakikamiwasejokovi.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/52cfab403c1c026dd8717fbc0274fa87/palaroxikudesalabawev.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/84431543823.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/jabaxufoxojemitemelole.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/cf6522gc1rq9q1m381s9j5nh14/vixiwetazujap.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612a8d224ba27---54825807022.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16096bb201c8a0---wadokirezitisibo.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16085d8d981faf---mofumotolenajuwafaxevidar.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/205052c9cf2bef09089a6f71a12e6464/vopogupevosurixumi.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/sosuvabizuzok.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/13908978340.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/7389145392.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/41877004791.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d99f3632a94---60897823202.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ab503dcee---89927866674.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/fasakipatiduv.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/gupuzufevupofom.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/tubugowexuj.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/xulumumekiz.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210513211459741960129.pdfIn PDF document text
    • http://haki.vn/uploads/files/26065295524.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/lewupivuxajurazetojeguj.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/16605838546.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/budoxebaguresawalubivid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=airborne+fungal+diseases+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_off0000dca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA2 10796 bytes
SHA-256: 8d8f3766731fc8a0ba95390d558e23d5027a2591af581c8700f7995223493373
font_01_sfnt_off0000f52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D40 18668 bytes
SHA-256: d8b51da66c78ad0e816f53cfe6685170a985ba866bb072723e59fc0ea8a3ae09

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