Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2236dab51a9cdf…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 03:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a211cb6621f9478f16692a8468c38bf SHA-1: 30a3df79b83973d51cda6c31daf5632dc8706d8a SHA-256: ab2236dab51a9cdfda2d4abec7f5fb6d4d9039550d8446aa324f1d45d340b1b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161321c09e352d---wuxarexowobap.pdf
    • https://bahia-group.com/ckfinder/userfiles/files/94432771744.pdf
    • http://blgjad.com/upload/files/16184888424.pdf
    • http://everest-c.ru/ckfinder/userfiles/files/70252158102.pdf
    • http://nicolalazzarotto.com/userfiles/files/91769291864.pdf
    • https://asztromiskolc.hu/ckfinder/userfiles/files/rerejabokezegogufo.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/lapiwaludaruzarovaju.pdf
    • https://pasationtravellers.com/root/FCKeditor/file/9365461518.pdf
    • http://studiotecnicomancini.eu/userfiles/files/66725388763.pdf
    • http://sistersaviopublicschool.com/userfiles/file/36375441310.pdf
    • http://ehomeforeclosure.org/images/file/70628624899.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a03714b661db27908f133b24adab2d17/69048511010.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/joga9p8g4bjk4qmbfclh3p0jtu/xiripapekixuledameja.pdf
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/wifuzixofixuvase.pdf
    • http://ventilatoryzlin.cz/images/file/nupoxavorexuvug.pdf
    • https://aventura-agence.lu/userfiles/files/tofudozejif.pdf
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/gadiz.pdf
    • http://aire-limpio.com/img/editor/file/45218436717.pdf
    • https://zhavezbozi.cz/data/file/vasujevupe.pdf
    • http://tano-cable.com/d/files/88448821068.pdf
    • http://www.premiumimport.nl/ckfinder/userfiles/files/dokepalotifibisitirapid.pdf
    • http://wernitznigg.at/files/wozudomiwodalukekopavixe.pdf
    • http://uceng.net/_UploadFile/Images/file/gejogolawuxixomatole.pdf
    • http://villabrown.it/userfiles/files/zufuwaxewopoluvelesimib.pdf
    • https://ivanamihic.com/files/82519609201.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=butuan+city+agusan+del+norte
    • 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_off0000b299.bin
0746bc0f6af0958ae39b4aa4683985b3ea46de61a27653d8d7e91cb4a36f1b2d
pdf-font-stream PDF embedded font (sfnt) at offset 0xB299 17424 bytes
font_01_sfnt_off0000decc.bin
0498730aa05465db3eef9bfbe4894dbcebef61121c35baf3f5a8a5844a279975
pdf-font-stream PDF embedded font (sfnt) at offset 0xDECC 10812 bytes
font_02_sfnt_off0000f7b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B9 16792 bytes