Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72f0bfb76a21e51…

MALICIOUS

PDF

78.9 KB Created: 2021-09-15 21:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ff5f051344a790ec2d97ec3292ae2f8d SHA-1: da493210f212d44cbdfdc8fda7805af1bce19a4c SHA-256: c72f0bfb76a21e5159a882892031ab7f61052329601812039b7400565771142d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting sites. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://inwebjor.ru/uplcv?utm_term=bus+simulator+ultimate+indonesia PDF link annotation
    • http://villaelen.it/userfiles/files/38302976395.pdfIn PDF document text
    • http://ymmicro.com/files/files/jodilo.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/joduzimipokazinutija.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/kepojibuwakizi.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/8ba1300c47687f60fbfddc572b598af2/98792804092.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/vabox.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613718bce2ac0---kejiki.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/53420852691.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/84511709819.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/gelepuduribu.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/vojol.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/tofozeluxifiwa.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f16a16a3f---75833115450.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/80765998687.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/52939088703.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-8/20210908022042541741.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109060926081359.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109110608277398.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e102e7b799---87646126692.pdfIn PDF document text
    • http://geasit.it/userfiles/files/kirolob.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/29539065073.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/gavufel.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_off0000cbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD1 19384 bytes
SHA-256: 60dfdab5d709c28baa78227383db40896b8e244ffb2a985f1f10a41e92e6079c
font_01_sfnt_off0000fe16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE16 10560 bytes
SHA-256: b7b4de479ac1cbc5da0ea47e3e5626de0087b2015eb8f2b00e9f1aecd93ce203
font_02_sfnt_off00011635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1