Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e4251b77e14e63…

MALICIOUS

PDF

78.7 KB Created: 2021-06-29 03:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3df7ec59a7c5bf0873d97cc91e6aeb54 SHA-1: 44df4650510f96da522e2b17055a4f9d2fd6e7fe SHA-256: c2e4251b77e14e631ad8c561496e872c2a36a1b8cf73a7e476bebee024656370
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads, specifically WordPress sites. The primary goal appears to be redirecting users to external content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://kystop.com/wp-content/plugins/super-forms/uploads/php/files/9e69c76693k3oo4m8ercek84k1/jajesimebab.pdf In PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/5ac6khtg8phi0rr5jjn3n8tct7/darufimuzijakaroti.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e0694d4f111415d420dab20dbfa38932/57606693733.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/ronezativu.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/bc1fa3c5bd7bf3e7aabafc33782fc8df/51038898744.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/4263e8d88d94683a63841f99564909b0/77922115216.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/gofaloxerizatudovom.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/wezazekomonobagudeveg.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/lah2l9hc473kmc4p3c44r59oe7/8663624677.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ubrmc72idhabi6vqvhd7rcvru2/11198715650.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/84160545488.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/jugosemego.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/6e26bcf9de0f1f19461629f1ccaddc9e/38068952681.pdfIn PDF document text
    • https://dm288.com/slicice/file/21627427337.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/e1ea99a79886a20e8dd3a5022b15d5b4/mojejewopinelomusomodos.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e5620100fefee7a88443aa63b0083d31/tejetumirojugudeja.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/6da192a512b53169343def1c9fe30637/64283105342.pdfIn PDF document text
    • https://avenue102.com/uploads/file/jewozonujosa.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/89747610264.pdfIn PDF document text
    • http://talleresjpg.es/img/file/kudovijejoke.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/b23c4fa241b3824b7ba77824bfc8ece1/89461686994.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/3d9706e1fa18e8f2df2ddd29ec69fe7a/sexesadoror.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=sql+certified+expert+exam+guide+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_off0000ce43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE43 17704 bytes
SHA-256: 431cf6cad04cf6cecf67bde02eb9a318ba3c8119860c77d3970d63c0145ca63b
font_01_sfnt_off0000fc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC60 10996 bytes
SHA-256: 6147f8d72f11c252f4eb91305e48db1f7b4541499816a5c1fad1691f8601312f
font_02_sfnt_off0001157c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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