Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3c1731ed98afac…

MALICIOUS

PDF

171.0 KB Created: 2021-07-02 04:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6b6291a43e57320c745928f5fd8824e SHA-1: 4f175bfa7606d78d39fee26e2b2c025b7186e48d SHA-256: 6a3c1731ed98afac0cc94707f93361e6cecd2774db8602955fbea5b9bd1623d2
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm containing numerous URLs hosted on compromised CMS upload storage and disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The document body was unreadable, but the presence of many external links points to a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

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://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/sjvrcbab7e7d8oc94dkrjcts06/86968359651.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608137a1af5e7---65012431652.pdf
    • http://rolmech-strzelno.pl/Upload/file/32221675433.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24fa0d0a8---jedubonibosowilume.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9557d3daf0---45761253950.pdf
    • https://contabil-fiscal.ro/mm/file/zoxezuvubawokako.pdf
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/risasurotanewiri.pdf
    • https://mecaniquekd.ca/upload/file/sesexojaj.pdf
    • http://tlproduct.com/userfiles/file/doguvupafuniwulepofegit.pdf
    • https://actorconseil.com/files/file/1630616358.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2a39e007a---rosakejosezi.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee82a9b770---zirazele.pdf
    • http://isagenixmakessense.com/ckfinder/userfiles/files/9502449142.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7af089b9f---nudufix.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b4df5110f0769ac31024a055a1bb579a/26185663502.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/229fa5orqdfaani76c20plctbv/94361203376.pdf
    • https://anmoul.com/userfiles/file/37150913146.pdf
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/gidolowox.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c1d0bcd024e15654f0dc3a89978dac23/14453704020.pdf
    • http://foto-video.ch/userfiles/files/dubakawusikiberivuledidez.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e240082740---mugeraperabave.pdf
    • http://svazekobciorlice.cz/userfiles/file/96422728585.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=thanks+for+bearing+with+me
    • 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_off00011547.bin
f8eeea4256e508796e8630b933dd289c8acdf93dd0b096f6903cf87a62c97e79
pdf-font-stream PDF embedded font (sfnt) at offset 0x11547 10896 bytes
font_01_sfnt_off00012e6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6C 16792 bytes
font_02_sfnt_off0001467e.bin
a2d17bc3d3a7d23ea5c645b0814a03fb9be6f8469b7eb8c566092eceb14e678e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1467E 17316 bytes
font_03_sfnt_off00017398.bin
5d3a562e957466affb2416babe63ec78a165ce90ac26d34dc82581e9b5b7cacf
pdf-font-stream PDF embedded font (sfnt) at offset 0x17398 120580 bytes