Malicious PDF — malware analysis report

Static analysis result for SHA-256 2062bf89b24ca43b…

MALICIOUS

PDF

79.4 KB Created: 2021-07-01 12:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c84dc4be1ad718a559813d275200538b SHA-1: 71f9ea5b6a3d8ff74bc4a3812339844fdb68fc8f SHA-256: 2062bf89b24ca43be64e7e871c11694f58fc1d46c69efcbfac42f3f2a0d7517d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on compromised WordPress sites, directing users to download other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the presence of numerous links to potentially malicious files suggests an attempt to lure users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/99fbf72ed77d79ec2a6b3271a0381bb6/6548477777.pdf In PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160759aa9f186c---88740608264.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/bapamepimawiluvimaj.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/7cfe0078b072f42ce4f8a25879f901e9/2127220423.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/riduxibamisupipowikun.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab24ce92bcd---boronanonafekefizux.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/1bbba35e12f0e995362140613d4c15e8/57385502912.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/47007353582.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbcb96150e5---ruferesidibiju.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/3b2a79f6e22f572ef3569c04acd51364/naruxelak.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/tefifenokavoxeso.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/sebaboxidaxuwataruta.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/27315673620.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/80303508311.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f273b9ece3---40477210270.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502073720493831.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16098504ef3942---28500109827.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ad8ea1b70---63580405188.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609849631ec7a---fopajowuresomuxerifem.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1b98a5705---dotin.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/42778489416.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/fuligumasigasax.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/cmrgol9p0s7vvenn8nk3mtlsm8/limabogiwizuzefimasen.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/99487970194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=house+of+cards+mp3+download+btsPDF 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_off0000cb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1E 11180 bytes
SHA-256: f1e278133e93f19c0bb3bed7dc4cdb5f48cfdd2c2c8da0c0d2a376815f95bc2d
font_01_sfnt_off0000e523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE523 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD35 22304 bytes
SHA-256: 4cd02af8b7fa533887cd14ed305190773ef6bb0e16a6e6256ecfea7b4d73cee3