Malicious PDF — malware analysis report

Static analysis result for SHA-256 052610791e5118cd…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 11:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e78ee89e7605503356c6b90a8a138cf4 SHA-1: c2da3a9c245b6e9ec34fca4a12764aa9ad591eae SHA-256: 052610791e5118cd69e14356945628a30c40964c1052785e889137a5d1d1a234
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the link farm structure suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://catamma.ru/uplcv?utm_term=age+of+empires+offline+for+android PDF link annotation
    • http://kondicionery-noginsk.ru/upload_picture/file/10774889218.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613673b90db65---jerebifigudagoku.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/7a00d881ce974938f45e808c5fa4330b/45979364322.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/221a2c223ad0a521ee023b90a4339b1b/pejejokopigupazositineta.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/48068723120.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/84tof70ufa99vb5d4vt398bl2k/jusodekoge.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ece0a7046b---34488408464.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/fowizuwoxex.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/5276955043.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/86390414809.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/sotaxifikolorobun.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/ratamijekesamumolarobabiv.pdfIn PDF document text
    • http://carbonelite.ru/file/fajeduluv.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131db0991ebf---rebububenobal.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613100bdcfe0c---wabizomori.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/49669784303.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16136f436c0b95---48065576613.pdfIn PDF document text
    • https://zzhqhi.com/d/files/70776126824.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/simasosepepaximud.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/zikabavejaboxonasedogowad.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef5c4ebaa1---59211104202.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/tavipuwo.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/wadarebumikopagukog.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/wewodir.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/5564083443.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/sorunupegatamokelubi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F0 10724 bytes
SHA-256: 807a6c21fab7cc7c1bd2a49adfb090984623ae675e547d3dc149556755fdbcc9
font_01_sfnt_off0000df44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF44 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8
font_02_sfnt_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001000d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000D 23780 bytes
SHA-256: 37cd8c6a24fea476f62cba9a1800610f83a7572be71b434f34a75b2e7fa4e3eb