Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b0ced91e774634…

MALICIOUS

PDF

72.5 KB Created: 2021-09-04 08:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: caccfed44d229f4c5a9649ad8dcc4c5a SHA-1: 32c9f74da344772619689231c93eed7fc8fc964a SHA-256: 57b0ced91e7746348a226d95269843666d70a8fa8d130fa39c9933be0b0d59c6
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, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple domains, some of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs suggest a phishing or malware distribution scheme, where users are lured to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://zavalinka.by/var/upload/file/30351817936.pdf In PDF document text
    • http://0-50.ru/userfiles/file/litawunakeju.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/o6rectjgbrdvts8flbcdnmmqaj/vezesitogigabe.pdfIn PDF document text
    • http://wawa757.com/uploads/files/safojudalin.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/towazonirazago.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/4edac9eb50db38542dc374b668725fa7/bokedejem.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/16068379863.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c129b2ff5---mojisufitejaja.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/lazeki.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/0d9316f21cb2594e644dec1f6aa748b1/19370140855.pdfIn PDF document text
    • https://digireg.lu/upload/96060180090.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5d6f780b0---vanejevesinu.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/91510370288.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/fopiwugabipemedexawikuxe.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/75437229735.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/kodemaboka.pdfIn PDF document text
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/41002999569.pdfIn PDF document text
    • https://ocw.tw/uploads/files/5418806097.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/81821295101.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/36036791235.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/17bl53uh0k9aic2tnfku8ft519/93181727438.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609483cfef6b3---wulevibapolitejajeku.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd99850d15---35609551975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=allen+%26+heath+qu-24+chrome+edition+digital+mixer+manualPDF 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_off0000b86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB86C 19044 bytes
SHA-256: c2b4d3513cc6f1beffdfe974587f8f1f48a84428496a2506b32cfb5c74757b53
font_01_sfnt_off0000e89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89E 9336 bytes
SHA-256: 2d63337afeb2b60075ca4f5a7453c8e1457c293990ae6b3fa4f368abfc55fb46
font_02_sfnt_off0000fc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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