Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f3ee0add67ac84…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 00:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ece5148b7841f2436a0572c685db3042 SHA-1: 4665cbb1b7c44b5a1574fb141ef3c0b8a352a991 SHA-256: b4f3ee0add67ac8492d1f7594ca0145c73ec0f572054486f656b4f77b9820ef0
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9753

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thailonghoang.vn/upload/files/pimavidalusizimuvalovudu.pdf In PDF document text
    • http://balone.net/_upload/file///sulutaxitugusaxoguwud.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/25528541586.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147daa40bc37---papidakigig.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/golorufo.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/50781921162.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/wumesoselogor.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/55119572085.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/muwekifeforepil.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/fitenogowaza.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/magoteduvat.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/1213980069.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/lusepa.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/58989399105.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/butidatadatisanutuse.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/61904124641.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/vidifigosoxefalowu.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/b3c58f1b6e95746d339e8f9d7d1b2fe9/renunezegovajakotese.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/43449149470.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/49865595097.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/42542246919.pdfIn PDF document text
    • https://eurotig.ro/file/givenozopixadakigetebos.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/49565244169.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/10154010305.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/32760273589.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/90877305324.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613329c1b33ba---jinozanava.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/71509464375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=apple+ipad+air+2019+price+in+pakistanPDF link annotation
    • 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_off0000b451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB451 16080 bytes
SHA-256: c3ccf2cc8eb6c275ebe00c584c725b13a2ec2d30555bd265e02fde8e735ab212
font_01_sfnt_off0000dd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 10920 bytes
SHA-256: 6fd7cec99e15e0a8e773051ecc24faddbd5aaf68691257135a6f9589da55e559

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