Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4dee5f09becc8c3…

MALICIOUS

PDF

87.7 KB Created: 2021-07-05 06:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a782ec60e81d8424a576bd88d0cc1401 SHA-1: 43e1511b87b9e5f8b24e85153ba502c3a7a0ce6e SHA-256: a4dee5f09becc8c3428607976a1bdbd44655814555a0766af8e3f8825599c48d
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites acting as hosting for further PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/2mt4ihqb9ts5qdmmhdf9vitpkb/bigopa.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4p6jc67j0329n4udm5st6eot1r/dasogesupemewafasadu.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bd3b87323---56033786961.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088e6c382441---mavepol.pdf
    • http://anhuifan.com/upload_fck/file/2021-6-6/20210606021255456330.pdf
    • http://olympusflights.com/files/files/gapabibusekuja.pdf
    • https://maturana.cl/upload/file/24505172130.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/28042700236.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d2895e07f---34238471997.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607214515be7d---tijoze.pdf
    • https://langestrand.se/anvandarbilder/204/files/todifarezaxunulamagoguvi.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/96365692566.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/2t24k78g2ndg9cge2phn5l9k1i/9231487059.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/6e7f9027f1708bab1624efcc7e1f322c/levusovakelulaf.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b894770497b---10119122652.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/50211240423.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/39af4fa42454fc781a1f48a192189d1f/79660676833.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/18e0895a11a8fd7a02b4440cd82db114/sogajojerulopivumeja.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970d9c57026---lerufigexidobod.pdf
    • https://condicionamentofisico.com/arquivos/file/dusorufebexon.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a31c381579b---delunuxepatinasijefegi.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8fe0a3275---pexevagutabirilowak.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/fd06ht5b5o022cv34gnbtjak32/velutuvubekejidivuxe.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/5f49c96283e160868f0c4abef517a64f/sasupokixidafixute.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=e+governance+mcq+questions+and+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f55b.bin
7e390361b117c026e5c89a701afab47c8154e4e8bc9d60d5ea6380db108ebb65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 11048 bytes
font_01_sfnt_off00010e9e.bin
f7194e891b3e1ff7aedb80d3b235d19ff28e1069ce2f3e4ef47571ebbc5b2ca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9E 16844 bytes
font_02_sfnt_off000139a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139A3 16792 bytes

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