Malicious PDF — malware analysis report

Static analysis result for SHA-256 9726c1a674bd3862…

MALICIOUS

PDF

77.2 KB Created: 2021-07-08 22:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9101d1f3c928cb1b6ffb26bd93c43681 SHA-1: 84eadfaa61abf838f1965d367e96ded2f494faa6 SHA-256: 9726c1a674bd3862dd138cada4f02a5ce2f1f1feccb10cabf958645cb1ef9e31
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crysiq.ru/uplcv?utm_term=never+back+down+2+full+movie+download+in+tamil
    • https://chetanaus.org/bheru/uploadfiles/file/73004329315.pdf
    • http://artdealer.vn/upload/fckimagesfile/dea85717b16f40f76dd15a0a0bdab8aa.pdf
    • http://igigeothermal.jp/userfiles/file/pirozinogawoladul.pdf
    • https://pet-fashion.ro/mm/file/gudevodezosekewo.pdf
    • http://norilskgu.ru/userfiles/file/84133345068.pdf
    • http://luxmeterthai.com/ckfinder/userfiles/files/kisodineralimizida.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/2348c5463bb2ef7a6253d42e283a6a70/jerelogobutumovibujid.pdf
    • https://genimmigration.com/viking1/uploads/files/77420524558.pdf
    • http://virtualcharityevents.com/vce_cake/files/files/dasuganokowepaleve.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/aaf92549d0f5532ba26ed6cc97c69303/86579821123.pdf
    • http://weddingceremoniesbybev.com/clients/72651/File/31943099441.pdf
    • http://simpelms.nl/userfiles//files/92797570639.pdf
    • https://juhaszautovill.hu/userfiles/file/73433486423.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de3e25f1964---wizubexuvalibigoguli.pdf
    • http://lightningriskassessment.com/ci/userfiles/files/39938412328.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/7kl966r0rup02mo8ot2fuqmlhq/giwexajotu.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/5d13fc8475e2f77033d1302d97af3ec1/mivesekogugifo.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160762a28980dc---40053739690.pdf
    • https://adasms.fr/userfiles/file/bilegebabelijidovew.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b759aedb4d5---79674683724.pdf
    • http://qtjdb.com/UploadFile/2021/06/19/file/20210619_070556_128.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/87be9aec472a2aabb51f3397763c38cd/vosupimonabikenej.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9c72632cb---59704214308.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/00294700c8b42fdad6e345dfb63518c2/loxovevamesi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c683.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC683 16792 bytes
font_01_sfnt_off0000de9a.bin
1713ec18339bfa23e095623ea4dcec780c15b419db056331cc896c971b565352
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 11048 bytes
font_02_sfnt_off0000f86c.bin
870b561a018cde93f90c9d7d05a8e95ff2004bb348b86ee84ea18cc85283ac23
pdf-font-stream PDF embedded font (sfnt) at offset 0xF86C 17660 bytes