Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da210b3b9661efa…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 03:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 11113304806bf32be6c7a9788147980c SHA-1: cfef57ec814f38cf413167e05ff6de6cb76f3b99 SHA-256: 7da210b3b9661efa48dc08541a5a84221c09791b18eb603923bc668c88c60a00
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=artificial+insemination+in+dairy+cattle+pdf PDF link annotation
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/53884cffad0c5fddae26de8fefbf8220/sakakakex.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/dagufodojib.pdfIn PDF document text
    • https://bursac.net/userfiles/file/39488151014.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/wudexeziku.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/51619467202.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8359e419ee---89221555245.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/lufob.pdfIn PDF document text
    • http://i-dron.cz/data/file/48686431770.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f63a0405632---49612189916.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/090529391d6fe914a6d0afac8dada6f4/29859510890.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/dd63f30f1d02b307684974cf419167bd/45495617405.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/79697683296.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160af6cbf42756---xugimezigunoregiraf.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/96445912572.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/tebbmbic6bhcomtseroa3ta8k3/50188270538.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/76196881299.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cf19079a0---mosusexokeregudoxufokoguw.pdfIn PDF document text
    • http://poorclarescork.ie/images/pezevuxobagimedonomumoge.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/34846001311.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d11e48134e---50382688670.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/49271597828.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/zenoduzalefat.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa068a3a483---42606908149.pdfIn PDF document text
    • 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_off0000e021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE021 10876 bytes
SHA-256: bd4009019ac1fb80754a9fe0da47c0ff24ea004f4f1dda5925664e39c5d5a305
font_01_sfnt_off0000f947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF947 18452 bytes
SHA-256: ce5e202614d7db79c8a2055be888a4533481d90867c96a98ce0a27161d97b842
font_02_sfnt_off000129e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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