Malicious PDF — malware analysis report

Static analysis result for SHA-256 864e63f179a2a978…

MALICIOUS

PDF

100.7 KB Created: 2021-06-30 00:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0534102994d5d9c5a6e521068214d523 SHA-1: d7eb3beaefcf93ea8690c6d4b3125eca63859258 SHA-256: 864e63f179a2a9786c7821ce1d67a3bc6dd2b03ffef5303cf5ff5cfec9f833c0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, indicating a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing content, further supporting the idea that the links are the primary malicious component.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/q4q16mg5sqmc7ikhkass2uqq9t/52226278754.pdf
    • https://liantoong.com/archive/upload/files/81635549201.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/83e8b6252c3163e6b57c89e011ab66c2/25630416458.pdf
    • http://circuitoinsulargc.com/documentos/file/89906176501.pdf
    • http://hytechplus.com/userfiles/file/wamotuzejimojalod.pdf
    • http://akcjonariusz.com/UserFiles/file/sedorekelesu.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607428d22b4da---49187902327.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/sr8ujgfpvq2sl99skrfvpescfp/59007428522.pdf
    • http://dok-vo.ru/userfiles/file/22473700125.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/f4cb0574360497bec25025f1438c6c12/gugobiguvarijemedezezitik.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787a0b4ddbb---gebajufofageki.pdf
    • http://perlawarmii.pl/userfiles/file/wopujomilasizixefaka.pdf
    • https://alakharia.com/public_html/userfiles/file/74750228530.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/f2c751fa2c92cb903b5662a2c55348d0/60470751907.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/6132eio4ti39ctnd5tu4dsid1q/53550257788.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/ca7d3c621dbac19fcfafe03e77295288/liwaxugurezun.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/d24a2f6275cd24e3690eb19336cbba60/wipiretekifokamoniginesu.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/519422a8aeb3a4f4fc0395ef3c24726f/49744366189.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/v18ufj773ef86vpiabk21niobh/xipotuzoxopasopozi.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e628be726ad5d3e91bf29b4fcf6bd1bf/wiramebutodajusowezexiju.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2afbac648b---dufewodijarabavani.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a4264798a2de3051738f673a0c735b43/xevabun.pdf
    • http://elazentrale.de/images/uploaded/file/nowimaj.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/ccef852cee1b866101672c208004136e/vivuzesevekokupu.pdf
    • http://ehomeforeclosure.org/images/file/34847307396.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=2003+ap+calculus+free+response+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe5f.bin
52bba7e64ff843838dd47cc6e557801e8014d121dc08b609293aa701cff54afe
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 10784 bytes
font_01_sfnt_off0001177c.bin
14b4232b81f95e183684a48d2082d7f39b360f7849cb146ce4629c520a18ae46
pdf-font-stream PDF embedded font (sfnt) at offset 0x1177C 23244 bytes
font_02_sfnt_off00015207.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15207 16792 bytes
font_03_sfnt_off00016a14.bin
5b33412c50beca2161b280303537a9049b05ef124aef4eca09726569a7ebf81b
pdf-font-stream PDF embedded font (sfnt) at offset 0x16A14 8880 bytes