Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1220b5580155c90…

MALICIOUS

PDF

73.7 KB Created: 2021-10-03 12:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f649b8274d290aa60307ea0b9a473882 SHA-1: 12cd9b46871ef2c10627d2e4e7c12e7cf5fcef37 SHA-256: f1220b5580155c9041623bece7574811ecdbdfb1ec57d26c507cdaf5cf3576a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URIs and compromised CMS upload links indicates a redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://toflight.mobi/attachment/ckeditor/files/34e4b4691898eb3f02229f0878fa029c.pdf In PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/57463331410.pdfIn PDF document text
    • http://jobsmarttampabay.com/files/public/86239120666.pdfIn PDF document text
    • https://gdaniec.com/upload/files/19559010865.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/nutivufuxose.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/4e9259363958da6f2a0512907ea79d9a/57723865653.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/zisurawosunimupoxefe.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/aaed4f7473e6673c30b557618f18f414/sosana.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/roxeretinudiwaz.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/76110881665.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/dibubetotowuf.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161589e05bcc68---kudodomifaguwijuf.pdfIn PDF document text
    • http://ccsl.asia/files/92832000734.pdfIn PDF document text
    • https://eetravel.net/file/87802523437.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210905_07791F8E7CD41C2A.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/fagidolukunomejiguv.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161566e1489822---nizonijota.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091812343432.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16148631b76cd9---37612736259.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/punedinivibidugezudagetot.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/dewaledekubivotaburitumi.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/rilovibutokirufediwutijos.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/takulekujumifibixexeba.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/46437252021.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kukomamidirokujonujibev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=think+of+me+piano+sheet+music+pdfPDF 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_off0000b97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB97C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18E 17772 bytes
SHA-256: ac5d2cfbe52c5019c4c50a3496fb4e4fb3de813de1b203a3e7b4c6e18bfe0a16
font_02_sfnt_off0001000b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000B 10896 bytes
SHA-256: 50fe791319874a136966d63cb256c1129bd4d462b5d3c2ca9463c07813d6b668

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