Malicious PDF — malware analysis report

Static analysis result for SHA-256 194b2dc1516476c0…

MALICIOUS

PDF

89.3 KB Created: 2021-07-27 20:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f3e99071576d899ee800c0c2880e7d4d SHA-1: b50fc0cdf30e427e793ca62c310a84096fcc9dd6 SHA-256: 194b2dc1516476c0251880f8deca7bda1af70f5a70746a90f8b4bc8a62599d90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://0a3exp.com/upfiles/editor/files/30910422566.pdf In PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/rokilexewasavizovex.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/78578055132.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/22812219808.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/11923845937.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/wizukukepolegofekixol.pdfIn PDF document text
    • http://isvpro.com/custom/files/wunosuxulurasifurabowem.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/98982697185.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/direk.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16071758aabddb---wadevegolajazulefig.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/toraxilowedu.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160865990eec32---telogekinonuzimizixalozas.pdfIn PDF document text
    • https://carlojans.com/cms/file/juwejokojixefodidi.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e59e5a6a02e---ruxufadenazisisim.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/delemiwar.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/xekamos.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/52771156292.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210619_08F65A64F54B848E.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1358fb87d8---10739294554.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b72a36c5359---xawalunebibej.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073edcbc30ac---fipibamewosuzekiluviwe.pdfIn PDF document text
    • http://midel.me/userfiles/file/gamoluwogufudij.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/lg8ajdh07nea48qglcur0ictm0/96895781232.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16074f876b58f9---lupugatava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=concepts+of+programming+languages+10th+edition+solution+manual+pdf+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 17928 bytes
SHA-256: 36f43b44bbb6a14dcb56ae0ae44466a93dc02e13b2583d612c4c93dd43337fda
font_01_sfnt_off0001240c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240C 11372 bytes
SHA-256: 22a66349d12bbe508717518b3afe32bf1c97ebb033769c28a277217dcd75694b
font_02_sfnt_off00013e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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