Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f742cd57400db7…

MALICIOUS

PDF

75.5 KB Created: 2021-09-03 19:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 5292b61e2bc23c6d2b1df9c6f74bad0b SHA-1: ebe05851a691af435fa10c8447845858f1f141fb SHA-256: d6f742cd57400db709f7d5561eb235ba0742fa2c5f8878c9eff8cf38be033477
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised content management systems or disposable hosting. The document's content, though heavily obfuscated, suggests a callback phishing or tech-support scam pretext, aiming to trick users into calling a phone number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nickels.design/ckfinder/userfiles/files/ponemabetulegiko.pdf In PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/f0500673bf7506ae78f7d416a3520f36/58355207045.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/letimijapubudovawakafof.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f00d67452a---73878413553.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/romuzola.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/28718245395.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/s29co0mc1ja7qancbogt2729cd/63619498765.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/tejogofekurox.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106200012585946.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/unlnid1m45jkrd9570qdv78j46/nozolisopozugujop.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607729fc21098---13647236379.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2320f6c5ca---8991577240.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826e5e92300---fenalatedo.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a96e204f957---85083031410.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/92182002850.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/ljvk0mib3veo5hpol9gkcjks7b/lonolajedamatunabeguge.pdfIn PDF document text
    • http://jaatkinson.com/userimages/56420536124.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/46045502218.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/81151823344.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a14c00fac4d525aa066c61f7f9ac7fc8/41320247947.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317f4bcb907---796810357.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b3e14129cd---49181240702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=bradford+hill+criteria+for+causation+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_off0000c650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE67 10872 bytes
SHA-256: 30c96d5075d2b7a0d42bf27393094fc52b64ebaca338f073f022862e872ffe81
font_02_sfnt_off0000f770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF770 16276 bytes
SHA-256: 6e9d433dc7e26265aa055db789749d03c68dc6fa4fa13c20d04228691746cb75

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