Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0fca62fee14d1f…

MALICIOUS

PDF

73.0 KB Created: 2021-09-05 18:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 81871ed2cbf6e881b2be30f44bfa638a SHA-1: 339f8b303884676c6e50d21f30f7b1620831f70a SHA-256: bf0fca62fee14d1fa920200c9515d1750c952f65ff18530069cf8c4937f2e67d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites or phishing pages. The PDF structure and URL patterns suggest a phishing campaign aimed at tricking users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=properties+of+matter+by+r+murugeshan+pdf+download PDF link annotation
    • https://actorconseil.com/files/file/48076891895.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/50782070608.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/sibetowulojomuwesunew.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609326944a627---vebelemunudovamafevore.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac50cd575bb---derutitebuwoninidopejago.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/fugesenofisubotubutosok.pdfIn PDF document text
    • http://banquat.com/userfiles/files/14440971138.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/zakususukiwobeka.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/28752589758.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/xevavexigiwimatazu.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc941bca21---17394953183.pdfIn PDF document text
    • https://southafricapools.com/contents//files/37176920420.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/98311950588.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/1244193792.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/rusitokimosekotef.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/c58b4b4eeaa661f79207ff96ead6c369/sifuwibadaxozil.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/xofetuwiserurimusixa.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210513215013532.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/57907866675.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/64638064692.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/53378938355.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/78501188287.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/b9bb6tqrakqmqlikeqt4vt3hr2/juvevot.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/a67f55b7bab1f87886bf4821a5344eba/71608968468.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_off0000ba61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA61 11388 bytes
SHA-256: 98d820a07db1a037b1cf11d2e253ab20936d197f8b5f6318757e908e907035d8
font_01_sfnt_off0000d4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A7 16000 bytes
SHA-256: a4aab6afd39efac662555301e63998db35b12b08f7833c44d223fbbceb8dfb65
font_02_sfnt_off0000fde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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