Malicious PDF — malware analysis report

Static analysis result for SHA-256 b846f5cd0765a00b…

MALICIOUS

PDF

87.8 KB Created: 2021-09-02 06:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1780a4bb4c7e2f8eed5e437e58a2ea2f SHA-1: cb3653904240ee8db4bb6277d0db948a1775844c SHA-256: b846f5cd0765a00bf856564bb7983fbfa41d7cf010f4cf0666ef71c7409125f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cardolf.ro/files/sewaxesutu.pdf In PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/62453a0bfb206f0566aee4634bf5d210/vetumajakuburagusifo.pdfIn PDF document text
    • http://clingac.com/d/files/229553206.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/74114766364.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/5b9159cbaacecaca1b9a5c522ffd0566/limebonuvutifatemawoga.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9bc97e43dad3752f2909f794f2ff7b7d/fekujoxad.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/bbb8027b7397cd83b87071e0386019c6/jemuxu.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/peremoxazodibabuxi.pdfIn PDF document text
    • https://abeess.com/userfiles/file/sulusetunutitixeranobed.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/9e11845bfc729daae47a2fb27099ccc8/45859019576.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c3a970c6e---guzaxowigoxib.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/96200164649.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/a3ad29b7f48998abaaa431ed7fe8e5df/zaponekisenekatagivobeze.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612b4e88eab74---babodezajapoku.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/41939249e41eadd9858c4d78d4114a20/54180995035.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/f365786084eea5b0ee56c0b770c66e26/gemidagosilidoje.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/99e734a103154f4ba394b7f559cd8123/mabagenejolilavowutofago.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c654b006ef---kitibobigoramusizow.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/zimedomedukibu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d054fe03b44---xabivowijujuruvobo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4584610270c3730480755b5a81695991/nasimadevale.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/27753012151.pdfIn PDF document text
    • http://industrialdevices.in/uploads/22344509638.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/powitor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=could+you+do+it+sometimePDF 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_off0000f3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBE 17636 bytes
SHA-256: eb01c70d73100d2d38dc76bf9a3cbe47a0f0c1b43260d87db802010e168627dd
font_02_sfnt_off00013984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13984 10288 bytes
SHA-256: 93d68a4bd8357410d2944f4c756a4b2b81e91fb5837324479ec8b906f3c71b6d

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