Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f86a8db96c23197…

MALICIOUS

PDF

85.3 KB Created: 2021-06-27 21:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2c2babd7e953b9f5cf96fc5f57d6bd01 SHA-1: 6bb07f6d5e3a6c5576eaac7e3b9b8fa038ce9df2 SHA-256: 5f86a8db96c2319770caad1320e2de0f22f6eee1e1c6e0ea2d64856f49e38439
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b23708e839a---66472880380.pdf In PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdba04179b---36111612300.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ce500e911---webolibitokumedekobixiva.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/d8669609f6bfa8a77adabca7628b42e1/lamakojat.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/59690174319.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210601_141404.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/32348542908.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/987796bd13faa380d6b8a4165c07f582/88235184382.pdfIn PDF document text
    • http://vce34.ru/attachments/file/sezuxejawezufolewev.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210606_2361044AE7FF8456.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/7150bfd94521f1fe3c82b6c37f15288a/14415032330.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/tesikenatuvarapun.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/96048027364.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974fd680779---24356346134.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/96evj7arerpo13oeub08ngo786/21560781438.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa8643c56b---7827156278.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/puvimilerokidujo.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/37020347295.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/sononifelojowigep.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/65a8fe1c6f2bfa8e137bdacd678b0b99/lukurapudaja.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/0d55c106c67810611b014fc665587b17/wusivemomupogimenuwobebi.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/13216304324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=90+day+fiance+stacey+and+florianPDF 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_off0000e73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73A 17636 bytes
SHA-256: 6462aeaad33de73ef091eaf8ea21bfb97b6124eb2e0a7e4323147efd400d6030
font_01_sfnt_off00011516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2D 10776 bytes
SHA-256: 7cc098fdf5ddc30a852dd64791954e3d44e2689c6abb7b45f1864363766ecc46

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