Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e2a4d403e75addc…

MALICIOUS

PDF

69.2 KB Created: 2021-10-02 17:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0145a1b0f4a94fe2bf391fbbadab6f98 SHA-1: c452b93df31d6ffd6870cb30f0ad1b4f7508a59c SHA-256: 2e2a4d403e75addc31f3b29d851041ec79776676521b190b262450ed9ddf17ac
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document containing embedded JavaScript and multiple external URIs, many of which point to disposable hosting or compromised CMS uploads. Heuristics indicate a link farm and a callback phishing lure, suggesting the document is designed to trick users into calling a fraudulent support number. The embedded JavaScript likely facilitates the malicious activity, potentially by redirecting the user or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=maths+all+formulas+for+competitive+exams+pdf PDF link annotation
    • http://thangmayedex.com/webroot/img/files/6973815396.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/bakixiniletabotad.pdfIn PDF document text
    • http://lovesenergy.nl/file/19367994457.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/da9928bafd1cadc0172db42c3c0df0db/88962211478.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/97647892786.pdfIn PDF document text
    • https://ccskin.com/geektic/files/69220076048.pdfIn PDF document text
    • https://gencatakan.com/upload/file/newuzijifajolavaziv.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210921_01CD5983D1BE3809.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/16261025600.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/27756193326.pdfIn PDF document text
    • https://egca.fr/userfiles/file/94180857072.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/99637824127.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161532fefaf8cc---16053594123.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/20741671519.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/70364655604.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/mojisilufiwutupapubamif.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/gagazusojofevikuvolotane.pdfIn PDF document text
    • http://dongphat.net/upload/files/27190401920.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/72272738150.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/perivanevodazo.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4eda927e1---jojepema.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/24952114007.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/bakexuwamor.pdfIn PDF document text
    • 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_off0000ae60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC677 11044 bytes
SHA-256: 32f4cab650eb24c6d30b0681cae9790278685490a8273239f481c6370ca0b092
font_02_sfnt_off0000e03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03B 15340 bytes
SHA-256: c3bd863364e869e61589d6f5c48b4c0ab371f4d6850f2cd6f4ce374bae87bfe8

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