Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5742f1e91a6a22…

MALICIOUS

PDF

70.1 KB Created: 2021-09-29 10:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b40d093e2a1f4ae57df56ce51960f8ec SHA-1: ef0c755d98d7bd91be5f106cfe1d19cbb4d4f082 SHA-256: fe5742f1e91a6a22b628c3fbaf4d150885083fb9530cab0df3918a34d39d8390
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that point to external websites, many of which appear to be part of a link farm strategy. Some of these URLs lead to compromised CMS upload directories or disposable hosting, suggesting an intent to distribute malicious content or conduct phishing operations. The PDF itself does not contain readable content, but the heuristics and URLs strongly indicate a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=watch+me+before+you PDF link annotation
    • https://pingthye.com/userfiles/files/5856104604.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/fikuzurisixuxeno.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/99325576482.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/55467009053.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/gosazepapagepivafe.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/dad38135ddc8b98b86c86d7a191eacdc/66868318306.pdfIn PDF document text
    • https://ubranni.com/uploader/files/13457571941.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/sezakifov.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/luziregexud.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/libegubiliposini.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/80942750325.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/4661187107.pdfIn PDF document text
    • http://greenld.com/userfiles/287003529.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/24346097571.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd7f5923e4---fakorizut.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/99057442098.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/53380677074.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/pepiguvawexe.pdfIn PDF document text
    • http://st03.it/userfiles/files/gedanasatobomepolusaneron.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/vuvumafavatavopagozavipod.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16152e88bd580a---38682145503.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/fesilitegirozasesuluz.pdfIn PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/81662860215.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/lizubobudupagulijokoj.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_off0000b0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C4 16564 bytes
SHA-256: dacfe04e585fbd8508d42ced1335bf9b12252238f38123c24210c2e692a7009b
font_02_sfnt_off0000f315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 10536 bytes
SHA-256: 06d62a0eccd69b32c358668472022b3c14d9bf8afaca5bb9f2dfac6ced4c97c1

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