Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8e41cf781d09fd…

MALICIOUS

PDF

160.0 KB Created: 2021-07-21 01:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bcbb5f73908fe41e59c136a51e478e8f SHA-1: c1a32e65f0540629528b1743d41ca882edd2e5a0 SHA-256: 0a8e41cf781d09fda39756c85c6da8b8a3d94189b3f9467fd66c7915f17f8eae
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised websites and disposable hosting, a common tactic for phishing and malware distribution. ClamAV and ML classifiers also flagged this PDF as malicious, specifically identifying it as a phishing trojan. The presence of multiple external URIs and a link farm structure strongly suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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://observatoire-omic.org/documents/file/40395306152.pdf In PDF document text
    • http://caratow.eu/userfiles/file/nisaxomaliruw.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/lisajusefusenurinorugijer.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/2l1erhb8adt44m3m53sb762kc3/89736351755.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/648622a1c9058dca03c5ace480741349/jugutuk.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/bad50d3776872f56dc47a58fb70f7e99/tewaropoged.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d9235a19c46---wutinobaxefutevoxuze.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba609834e09---lixibefuriwoketafukefel.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/12011854589.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/giragapiwawizefurizisujal.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160714a321c0ec---rikanukadi.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/251751a2c31d5244894ffe7107867ce9/xirigaropijokexaxafoguv.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075c8c6081bd---bawepubimegodemuvexip.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105210444342456.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210708052620.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/gtvlv22bv609oplcdlba062pg7/5822653529.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/kamironasugaza.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/gapimavumuwozojowinefo.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/dudipodomo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/l8nq7t7edabel89kmvbob5drg7/judofixuwatiwezikiwuz.pdfIn PDF document text
    • http://darec.sk/files/files/81124431989.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab60b79986a---nogapupojivezobeneperep.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/94866463246.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/75361313853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=love+covers+a+multitude+of+sins+commentaryPDF 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_off00021614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00022e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22E26 16588 bytes
SHA-256: d0e072cf786254b2e0580eaeb44e28dac644014215ab137cd7cd79b7f4d9f495
font_02_sfnt_off00025902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25902 10872 bytes
SHA-256: 6cd718c863a707ba49a4519225f53a030589b984413fa65da92881707ab4d696

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