Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2d75fc4c885ea0…

MALICIOUS

PDF

85.1 KB Created: 2021-07-08 00:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e281e891fa12612019b2dbc3f390f4a2 SHA-1: 9a67253cde1d89516af96e01ce5ab994c8a53a98 SHA-256: dc2d75fc4c885ea06c02dc3ed30172becebad29f0541a6e820bb11d86aeeb279
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on potentially compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm indicators strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a6dcb8397f35087dff1dac1046e8ff0f/zosuxemurede.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf57a56bf0---nesovejutige.pdf
    • https://bamfieldrental.com/userfiles/file/radatimedujabewuxikuj.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/1624bdcaeb817b41a30c5bd0a724163f/62137648507.pdf
    • http://614move.com/clients/4890/File/2200935066.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a3316e5302d---26518798552.pdf
    • http://dongkoo.com/uploads/editor/files/83463586161.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a51952f0e07---34931436377.pdf
    • http://www.zywawiara.pl/pliki/baluziwolawavakekokatim.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c88674ac9db---27294323207.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9b56031b5---nowilezizoserajanixexove.pdf
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/57797895670.pdf
    • https://sasalidayanisma.org/uploads/file/94768330655.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e53dea2c5c4747290a2ae393318d7bc3/mefijazumimivegubazera.pdf
    • http://akinmedikal.com/uploads/file/dasezufepokozamunekumal.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/v4f7o1b4houkves7fpsnrmhdc9/60443084463.pdf
    • http://mdknoodles.co/uploads/files/xisixitakefoxepoximexofo.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/420be8ab7f69c0e650fd869cf2694e68/nukuzul.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d222d3881ac---76055006105.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/timenowut.pdf
    • https://carsen.sk/editor_uploads/system/files/pifobopagilixawa.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a8ec14fd6---kigavogelora.pdf
    • https://creteotels.gr/FCKeditor/userimages/file/23222375878.pdf
    • https://cgeminfos.ma/upload/file/vevegezeweze.pdf
    • https://jotelek.hu/files/file/31748658603.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e02da581530---sileb.pdf
    • https://xn--fct8ml6mwue.tw/uploads/files/35463120172.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/9f9ca885ccaf242589555185bcb7ff4c/pofilevazufakila.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=future+continuous+tense+questions
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb09.bin
bd0ec6ff2c3120129baf91f8ae92513c3ba0b4b57472ff486a643de35c4f21e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB09 17236 bytes
font_01_sfnt_off000117c0.bin
f5908b78fb8623b27e31e72a5a569b47849227e7494453f04d24139bf6f26972		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117C0 10236 bytes
font_02_sfnt_off00012ee1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE1 16792 bytes

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