Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37c443690ee198a…

MALICIOUS

PDF

83.0 KB Created: 2021-08-20 22:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0e329858d47bbeb46605b71e8cbf6e94 SHA-1: e1a8747901a1652eac7adad4b2f7278f1857718a SHA-256: f37c443690ee198ad1a9dee981dbce9af0904806509d878c1dc8ac497d62af52
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised websites 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, indicating a tactic to obscure the true destination of the links. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://calzaturificiocatia.it/userfiles/files/wusiroxifimiremutisifava.pdf In PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160f85ecf67ca5---34065998246.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/12703953311.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2c02028b---tetiwixikasatekoko.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/74954609071.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5770f241c---47755384065.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/h2c0sgrmo9ck613lpcdhhfh4n7/98962834479.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/91707741541.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/tejovilerabisozunuput.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/lafakufitufetimo.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/ba9aaf772310d06c2fe4f91d78fe7a00/35635953120.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/3583430571.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/fee41ba5e6da97b1ed7bdf6ea73d458c/7478225191.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/10989931180.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/25201336938.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/65801498818.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f93e76c832---73990446289.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/e1f4119ae1d51f69c97de4d6f1584813/dujufadufafugo.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/bitikanetalubokewuledi.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/45244931c8a19b15f95b60a2999d60d4/4703731597.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/iv3js3slpl21845pgkt09f1aa9/jovifaga.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/2q2p50q39nm72nruqhjhmv2trq/97060243770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=sims+freeplay+hack+android+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6E 17372 bytes
SHA-256: bd84e943d22c0e2710055d39be0db350630b8d8b37c581b858d9f946b46241ae
font_02_sfnt_off00011b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1D 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_03_sfnt_off00012326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12326 11068 bytes
SHA-256: fa90ba4aa1f7b708b779612b26004ac9598ac2bfaf4ee17251272701f5fea549

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