Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca8a72afdf16196…

MALICIOUS

PDF

93.3 KB Created: 2021-08-14 02:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02e0e38cacbad8066a5692ed3a11220c SHA-1: 1e13c3143048695fe9945d55cc6b6ff091fad44c SHA-256: 6ca8a72afdf16196bd4701f9ce565a0f6ca4959de73a516b68d638e1548dd4b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and other domains, likely intended to redirect users to phishing or malware distribution sites. The PDF structure and the presence of multiple external URIs support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1504e5bc95---90861593293.pdf In PDF document text
    • http://www.bash.cl/media/file/gumubaxawoxabuvijoz.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/97136437177.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/e2538d77dc25cda387f42020921db3b3/63783599187.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/reguxezeruwepem.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/nisizuda.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/febadodatopilumodunuxor.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608106da89d16---rotovaza.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/vaevro83a4o84ijms3pho61bi4/figolarim.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790d84b3141---55527396886.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/7fcei41dh87p4jhgllq6doemv4/wezeserenafugupuwisonagon.pdfIn PDF document text
    • http://tulga.ru/editor/files/guwojemezofepobakumi.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/jakofelipuzapoxupogonus.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/78j1nivo8lm9hnfccqbmi5je0e/18174886253.pdfIn PDF document text
    • http://atomleasing.ru/media/File/18859566549.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/93153650959.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/doxuzarawelarexefozet.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/17660613864.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/minus.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b063264270---50691086711.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/82f6e8040df989937ad875362ef4392c/linapajudivol.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/fazenaxusobib.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/tezibazopasedoxezofasopem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+use+rug+doctor+carpet+cleaner+hand+toolPDF 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_off0001069d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069D 17660 bytes
SHA-256: 271fad2a4f190a48ef4140b1b9b38ee4833ed6e50e6cbc4a4db35b93848bd9b5
font_01_sfnt_off0001345e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345E 10880 bytes
SHA-256: 42ea8a4f7a0122c8cfd3d07047c92b5c2541758590c6264e25bfe8929876f07c
font_02_sfnt_off00014d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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