Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4f138f0f8f04af…

MALICIOUS

PDF

70.4 KB Created: 2021-09-04 05:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d04d057107ec5e6c09ed79263f73ce1 SHA-1: 0d65ef229bfc6767aeabef1477ddf8d704c9d69d SHA-256: de4f138f0f8f04aff660e87e7065241577802e7c05dd78a82954de0b82838e15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a phishing or link-farming attack. The presence of embedded URLs and the nature of the heuristics indicate the document is intended to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://laborke.ru/uplcv?utm_term=convertir+imagen+de+pdf+a+jpg+online PDF link annotation
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fda738d5bae---damid.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/69463142062.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/27365276520.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/fibepoluxuwakevutizij.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098641343a56---poduvujiwixoterakatelelo.pdfIn PDF document text
    • http://gdgom.com/upload/file/210624220112651552ho3gnyoj6mo5.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/kubawagunisu.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/m27nqll8krrt1q3gsh1ncmoh0o/wakinoxinake.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/jesawivo.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/28848079977.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a15a104eb87---pisapasog.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160baaf31011eb---zevene.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/npmvnsbm2s60u642lpn1b5glm4/divumafuwuwelevotosivo.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/27336794999.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/wavuwixaj.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/2f834ad371888daff4da742e6f97eb62/1445433557.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/sl911s63bloggp7rn5f4cpklnr/kabakowetezewonomaz.pdfIn PDF document text
    • http://pvvc.cz/files/gigakawi.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/85470432836.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d23b02332b---47385820821.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/mujev.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086b1db337ad---53891665250.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/48cb7c5d1dafb94f99ff8f90e5930fc9/nipifulikufidalegemul.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCF 14932 bytes
SHA-256: 375e610aec02293464c045459a2f62a0166a506ba50696caab370ce70390ac12
font_02_sfnt_off0000f275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 10900 bytes
SHA-256: b2732726c31cab2dff07dea3e7107ae84ef32c4c2b10cf5f05dbd8e7b5f06f3c

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