Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6bfad9d953dcec0…

MALICIOUS

PDF

84.1 KB Created: 2021-09-21 07:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 30b7e5520d0679588959d36c653a9ed7 SHA-1: 941b0635a5917df41a0268216071958ea896b1cc SHA-256: f6bfad9d953dcec00be682b3de5c7a4efe2cf89f8209f32c33676e38f64b66c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads, which is a common tactic for phishing or malware distribution. The PDF structure and embedded URLs suggest it is likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://irlanc.ru/uplcv?utm_term=pragmatic+meaning+in+tamil PDF link annotation
    • https://nistd.in/userfiles/file/823160244.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614408ca91622---gatajajodilujoweze.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/20219693981.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/napaxapepuzowuvuzedopi.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/45637701170.pdfIn PDF document text
    • http://metapolar.hu/tmp/26694474024.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/67127517529.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/55203046839.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/23006251011.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614816fed7588---24416330909.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/64595414021.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/kenonefelofimuzebidigabu.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/gijedufak.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/73987240852.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/tirotekutanusi.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161342cd96bdcc---sutumim.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/22579844487.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/8319519353.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/vixitoxefedofokirux.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_off0000d3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC02 10284 bytes
SHA-256: 3beba9fc5d5d04cb9ee8df44b033c30bfa3bec7e67ebbb5691708ddf794d0c72
font_02_sfnt_off00010318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10318 24976 bytes
SHA-256: 7bb9bbc4d20b92625fa7a30f9840744b2e348bc5c60de9724ba2ec14c0341160

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