Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3a2fc6ef907b66…

MALICIOUS

PDF

81.5 KB Created: 2021-08-16 16:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e886eb013075ac50733d4781077017d7 SHA-1: 1974c335e4ba10e604105cd0d8b6f7e9b6c4c865 SHA-256: 2d3a2fc6ef907b66936d89b04d8f14cb41b3507e7d5589b5a389a4f4c6c5c00f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2cecd1b2f7b4205f3fceafe47a8305b7/xirisotidewabar.pdf In PDF document text
    • https://bandai-k.com/userfiles/file/62078283297.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608bafa899344---xezokugalit.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/rf60vfhhl4lkft7nqv3nh8932p/44831001492.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811f4dc6499---27108129018.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa82647a6f---levoxidalatama.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/vives.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/jinubalafewed.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec51c9b499---xuvetazesukuxej.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/67922264296.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/4h9a5rc0qec6c4tobdfhavegcq/selagegonafobomi.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/c301aac1f8c41aa82cb393eab492bab6/1563119591.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/77a2d8mkd9viihi916dsec2dhs/54081880408.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/vibidomupolagalutubodon.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5523828225---sasukuvaluloxumifida.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/laxupujikigefofuruxakifo.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab2059b3e1---losubugilemurewokezis.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/bf6449b1c43f20900c135ac031d24232/36993960455.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/sevalezunur.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/kufasobububufinove.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/sijugisolijabexu.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/jedozunesalixev.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/11993874240.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/bobune.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/49653733541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=popcap+games+free+download+for+pc+with+crackPDF 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_off0000da6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6F 16900 bytes
SHA-256: 4f96f9edfafc946e0a8485c056eea6a0cfca6d697e539f97e4e80e5e51a91166
font_01_sfnt_off00010683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9A 11244 bytes
SHA-256: 7646f4d95ffc14cb48d3c68b86898108e9bdf6301db0ebee20eccb3fd25b105e