Malicious PDF — malware analysis report

Static analysis result for SHA-256 094a88be847ffa2b…

MALICIOUS

PDF

75.6 KB Created: 2021-09-18 03:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 232f133d5e53431560fd8271949acc02 SHA-1: d362b61eeb9f8981d26b845aeff42cb2010e5569 SHA-256: 094a88be847ffa2b438c88d175aa140f0f1b3b359bf2ef66ffb6540e0adb6737
196 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it is a remote-support tool lure. The document likely aims to trick the user into downloading and executing a payload disguised as a remote support tool, potentially leading to further compromise. Several URLs were extracted, some pointing to compromised CMS uploads, suggesting a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://elistaprezentow.pl/userfiles/file/82703813987.pdf In PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136067c8d384---kuxitepivaw.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/70865774987.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136689217ffb---31524662096.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/26112179415.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210909141452.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/likanijevefo.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/6f200584e70a4ced156c70819d651abb/96827391219.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/7rkbn2lcbc4c85pk2rkrnm6ora/7166041836.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/gatitojutisunaxokugu.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/13327300862.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/filutovumi.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/defesofa.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/44635547871.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/35161364840.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/37688169989.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/54297210558.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/97104708161.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/wadepowani.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/kinesexov.pdfIn PDF document text
    • http://lejuriste.ru/files/file/sumefol.pdfIn PDF document text
    • http://recrute.fr/files/files/negapefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mirror+android+phone+screen+on+macPDF 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_off0000c28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28C 17820 bytes
SHA-256: 140daf53693e098005b6020913cace51cd197356e883dff715bf0267182d57f9
font_01_sfnt_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B3 10628 bytes
SHA-256: 8f7242a08ee805ab1abcbcd4f13b02a5766e290c57c7f5abe715c87026c25752

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