Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc9133d78ace122…

MALICIOUS

PDF

83.6 KB Created: 2021-10-07 23:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 655392b43454982a5ededd4eb3112a94 SHA-1: 4ee1884c8db2b3af2449afef57102cb13b010016 SHA-256: fcc9133d78ace122e38f8a8615a89353ed4c34dd4d0477893cd92c2aac3cc30d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm designed for malicious redirection. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this purpose. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615e9c87b27c5---tifikakomekumegumegaki.pdf In PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/373a152a87ebee8aa1807e180e2310cd/zafesasif.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/862bf2c0e14dcd0c4904a29c3ef03640/83518902898.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/73622856114.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/fobeluxeganegonilafivifez.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394a849c453---subitiluzigajiwile.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/90233828607.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/luvagajavumavagexexixa.pdfIn PDF document text
    • https://vietcuongcorp.com/uploads/news/files/wodubiterakir.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/zenif.pdfIn PDF document text
    • http://rsentco.com/upload/file/sozabobanipinumi.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a52a624df---42836696183.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/siwoxi.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/97525572668.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5b7e4a69d---tupufo.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3af3a844c---nataluluzefirefazudewebox.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/gadafokojikasuviwid.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/85105379868.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/69153330833.pdfIn PDF document text
    • http://amkchem.com/upload/files/40390869133.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/foteril.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/podopisek.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/59033999420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=1040+line+16+instructions+2020PDF 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_off0000e23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23D 17732 bytes
SHA-256: 5928370fcd6a61b8d913e4fe52e9d07121d590ccaa94f9ba05e579b856575f94
font_01_sfnt_off00011037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11037 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001284e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284E 10604 bytes
SHA-256: e53db8e3d8ad21b77b173269b89e9760771278f79f26b8df5affc6eae585428b

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