Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27119ea6ad2f934…

MALICIOUS

PDF

87.0 KB Created: 2021-06-27 22:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07d8588a2de559bbfd720e4f8b61c3ac SHA-1: e413b1aaa05ecaa750b07394525b1537ab0b5b4c SHA-256: a27119ea6ad2f9348ac8f011752e2a09223db40c3f42226190670de615eda67d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The primary attack pattern involves directing users to external, potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://krisoc.ru/uplcv?utm_term=paper+towns+author
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdaa761fb6---vubitojovubevelasemisowe.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e7a32645c---89369059482.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/dd4f54b5aeca7cfa348388ac0af7fada/pefupu.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdd82d9bad---pejesuvojisabaki.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9589c574d572d4353961e1bda93b7813/51832480305.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/78fc63810e19626600e341f87968cbb6/vulesusagamipazexuxixivux.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/3aa06b9090452e2f30aae2f25efa24bb/genozagasu.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b43b2be8bce---73432920563.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/d868463b22cb963bd37fd544ad01c750/tezavafip.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f88f2da898---goxalegom.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/zoraxepufu.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c981ded4b---texotasexakokeburaro.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874fe6c8971---58402081605.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b46676f25---10081167998.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16092982d98a0c---34803353225.pdf
    • http://seoulsquare.com/userfiles/file/67675353089.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d10999ad54---23768121984.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/hkfvf0jlcj15ptv8l9s8d5ce14/bakawikimodewi.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/9e4a8b99f41cb50ab93260cb3fe35efc/36289260123.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609dacf0a04b8---55041128485.pdf
    • http://www.aportecnica.com/imagenes/editor/file/kuradivolixib.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/fad3abea0466ab6b01dc5ccdc79ddd41/bejafuribesuzuvudalerina.pdf
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/14212687466.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f090.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 16792 bytes
font_01_sfnt_off000108a2.bin
fdcf4fcb13e6de4f53b6ecd5e01b875eaab13c18d7a159148f243c811a6ba25b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108A2 17692 bytes
font_02_sfnt_off0001375d.bin
895d5ab067eb0d974a031cc1af5ffa5a18b90afdedc75adb815c877b36cb2905		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1375D 10400 bytes

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