Malicious PDF — malware analysis report

Static analysis result for SHA-256 4958d2a43f4d81a5…

MALICIOUS

PDF

87.1 KB Created: 2021-06-30 19:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fedad2661397bb4f8d4dd2d397ec8e62 SHA-1: f09ae81a152d6250bc3c3a1f7b1d35555f3f9b92 SHA-256: 4958d2a43f4d81a509d59c22b939519810f561a5beee85437a4a60192b3a2aa8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious files. The presence of ClamAV detection and ML classification further supports its malicious nature. Although no scripts were directly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e2862188c---63076584234.pdf In PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/87020137558.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/pazikebasodiregejurax.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/18958002891.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/c7dp8qnhc88nqj3qnv2s2a9m73/nogixoravomovanonuvumof.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/xiforobekamuvilebusobiw.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/52404832059.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acecf36bfe7---fodojaxuk.pdfIn PDF document text
    • http://519pf.com/userfiles/files/wutovi.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/ebd0b83f12f3d532b5693267419339a3/62758552621.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/u6d1hkahretapkhblkrr3jla26/kegezetatoket.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/29919701374.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2ff93d7ce352adfad419dfc074aa6d4b/26467855824.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dce3925bd---6885219506.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/145b575f88fa261ff8fd4766289e5d93/45172540489.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/jujemavubogodot.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/rutovefogofikunive.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/2474121140.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/a287973d3941041f916d49a2749155ff/27185904326.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/14863226443.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/zenafavubepoxumerevara.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb7caa6d6b---61885033299.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/4d82da3d6764afe970fe517a778a0068/24018738209.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/85191762501.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/43ff24dad3aaf4044f64f4b6cdd99fae/8232889690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=download+clash+of+clans+cheatPDF 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_off0000f2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 10468 bytes
SHA-256: ed31e78268f1e2d2d1d645e03420d00de66cef7c8f237caf2ba128089b31c254
font_01_sfnt_off00010a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 17080 bytes
SHA-256: 48b8132a82b3a4ca6dcbc1711763102991f8ceffd56d477212a78c5eaf879109
font_02_sfnt_off0001370f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1