Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c049ecc4abdb834…

MALICIOUS

PDF

89.9 KB Created: 2021-07-18 21:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cd4df4c7afe6d70155160722225c81e0 SHA-1: 980ce65944f70e3f05448ce884ce43581f9c2df8 SHA-256: 5c049ecc4abdb834c33fc58695f6640acc90433ed5bcd8ad59f69bb2588aff64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the PDF acts as a link farm, pointing to multiple compromised WordPress sites that host other PDF files. These hosted files are likely part of a phishing campaign or a malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b8418eee8---26674110464.pdf In PDF document text
    • http://matstravel.ru/userfiles/file/23070825720.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/t0sobtorn2o8i1fdl681j1pqqh/zafireluwubawibuzemuxi.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/xupovub.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ceb37d5f63---mezenezozo.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/5b71f63826de3520f8a7c7dc0b997ec7/nexapapenibok.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/79072364937.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/nedizapisabezaxejo.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f3fe5eb84---59598495762.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/rusimetarefegusevudejojep.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/noxapipumi.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608491bb6d066---90448802748.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/a6af2ae0ffc4c56365107fd9b7147577/zegolejagebiruw.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/22921936749.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/76285625164.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/87913157597.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/lagifo.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/45895385427.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/b5b634e911a2348329993ddc45ffed38.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/gonedateluzabubemebib.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/92472811437.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/4a4e99108b02409cd6c6724bff6db8d3/63261162168.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ujanazetesopexezotinut.pdfIn PDF document text
    • http://budka39.ru/files/97450733777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=900+calorie+meal+plan+for+10+daysPDF 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_off0000f9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C7 17292 bytes
SHA-256: 815d482a0dc9cc53680c722a1ba827757a8e944406692a26d6fe00247293083f
font_01_sfnt_off000126ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F04 11040 bytes
SHA-256: c32e5c4aeb02ebef2d16a617cd3519cc99198708adaecc33f4932dbaa0c94d52