Malicious PDF — malware analysis report

Static analysis result for SHA-256 c572af31ff2322f6…

MALICIOUS

PDF

87.5 KB Created: 2021-09-05 09:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a1cb1db50df41eb2c5306f1d9d0bd8dc SHA-1: 2040171980a8729108461e8647c2131becbc08d7 SHA-256: c572af31ff2322f6f933c5995db1e36615b1adcdee2aac1fe554ff55d09d806c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, likely intended to redirect users to malicious sites for phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=astm+e8+tensile+pdf PDF link annotation
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/5qvk90ved2ljtipu6lmf55bhv1/kisufujazowo.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1560571ef346143b0d0b4c2c40c6b25d/16366540597.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/29825432882.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/kjrr9l85eth385oobno3kchn12/viwopofuvovivu.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/57033f7eaa84113a1e2ed59b278329d5/1582502297.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210811110436.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/sirasetetu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c35777598b---suserupetogaxa.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/354e3e18d41a93a39736662ee6c787b9/13140037642.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/nojuwefexefifi.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc88be8bfa---pakivenikuw.pdfIn PDF document text
    • http://maxbrio.kr/files/files/55195652708.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/gusivibipajemowikix.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/wiwivedosufefiridim.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/27470910727.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/75e1e5a6b0a3627da65c5dcc169449af/60283740216.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/77lg9rbskibs4k7bf654mdje4s/zukapesomiv.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bf57c1da5ac---kirinepitanataxodopatasi.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/40604843025.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/detubavarinarepebanuvum.pdfIn PDF document text
    • https://citytrafik.nu/images/file/bozijetu.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9de9b04b2---wuwusejaliked.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/368ce4bb43d3e80ffe0a581439de3966/49262073118.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/tuxomadolatal.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2b82ef7a5---51482874338.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 19872 bytes
SHA-256: 5abe7ca4bd87088fa6ff4dbf9b053ca78f545a4b4bc74349796f6cddd9a89a14
font_01_sfnt_off000120be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D5 10468 bytes
SHA-256: 84789b15c960a4eb44fed1926002573e3ac56450436d986e2e92342d35b2ad0e

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