Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1db3c81b664482…

MALICIOUS

PDF

81.4 KB Created: 2021-09-08 03:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f76c95e86645dade59e45019ed741dd0 SHA-1: 1879c5291647dd781d50453db0155916c4256d43 SHA-256: 8a1db3c81b6644827f27c9a2841b9c6268293931331a344699bc172a500b3123
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://musthighschool.mn/ckfinder/userfiles/files/65940029617.pdf In PDF document text
    • http://www.ecvbrass.ch/user/web/file/73571038431.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/59010862253.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/30188462284.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d365767aad---1464843360.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/ralixijiwekogejafum.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/65879878167.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/4190e0940987f055515eb8fe1438a752/51397127578.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/19617084013.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/pelodedawifemidanofejaxus.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/78472315544.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc09797cfe5---25273379824.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/10782267449.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/2492968447.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/82354279782.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607edda83ae57---momutunabuwojoluxidelu.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd9034d012---zegobovivunefaledasewuzed.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/mimegonanu.pdfIn PDF document text
    • http://sam-global.info/files/file/nibij.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdb11cba2d---delimaruri.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/318991909.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd740df3e5---wewezaruxefomovijez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=jhum+cultivation+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5A 17088 bytes
SHA-256: 18593014633e6bb8cfcaaa03ddd2cedcbbadec9542e6135c5f4b03835136ae80
font_01_sfnt_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF9 10640 bytes
SHA-256: ddde7d0ced98f5c036b0af71a458f791633be613d450fe150b7e3ebfb955e463

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