Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8994d8da81cb93…

MALICIOUS

PDF

75.7 KB Created: 2021-09-14 13:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1367cd20b1dbaf65d109c5fd595a7c3d SHA-1: 32829bfa16c1a9644d26ed7c47f5ba338f6a2a60 SHA-256: 2f8994d8da81cb933e9f4c2c8057976e826fe4cb591b4a446fa10d2782ffb4b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://catamma.ru/uplcv?utm_term=hercule+poirot+francais+film+complet PDF link annotation
    • http://vngo-cc.vn/cooker/public/files/welekemob.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/11786217106.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ed568a8d---45411140052.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/094df0520c166c01b2ebd95674590fbb/xisewofa.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc380240e9---lobojanaxone.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/59305425344.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135094b3d9c2---tilajovujabitotugoti.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebced8594d---65130903728.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/sipuketidatuko.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/1282609960.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/94666061573.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/976593490.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/60206702255.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/wajojanur.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/wonifatogajidujab.pdfIn PDF document text
    • http://canoeing.by/pics/files/83608671821.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/xirirejojuxaxuri.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/87679823567.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/50337959155.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/23565856318.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/31112600229.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/sonitarumapenusa.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/76330079706.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/botaxubabezofalojusax.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/kanoj.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/14953747978.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_off0000c19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B2 10732 bytes
SHA-256: 738178d8fdd9dcf24ca98675b939ec367df194b31717f8895caa26d339de1653
font_02_sfnt_off0000f240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF240 17984 bytes
SHA-256: b0e9ca97f92146f9e6134945e0be36bd1a9d2072f4efec7ade6141a478bc4c73