Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e43acd57cdd7912…

MALICIOUS

PDF

89.6 KB Created: 2021-07-03 16:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a5aefc2ec622067c9fa9d0a9925af27 SHA-1: f933a40e304a4a7de59cc92cca3fd33e450d0772 SHA-256: 5e43acd57cdd7912ffc100f8ecf82d3d7ebb9ad9fe093701f8637e0378320687
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://rijst.nu/userfiles/file/boturawafezakaxebapob.pdf
    • http://greenhousehotel.vn/uploads/image/files/58806410717.pdf
    • https://prtl.pl/userfiles/file/budizilutegovetagotax.pdf
    • https://hosvagyok.hu/userfiles/file/5154833443.pdf
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/gamokem.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608464261f817---16510083797.pdf
    • https://ooo-kenk.ru/userfiles/file/wazitijikixibot.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096e223b97fb---rumujoxobizaluniviwek.pdf
    • http://angelescare.com/userfiles/file/47712929356.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c8dc511c5---27047822941.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b939ad0ae7---41843414689.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d05c42f821---34866811235.pdf
    • http://temple.mo/userfiles/file/29071746681.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/50283118518.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe83c1aad4---pazijudulonozutatopatuso.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b50f1c536---94013392015.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f8bfc14c9---fitetibixobafadugunosised.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160926a471103a---14369765835.pdf
    • https://mumegram.com/userfiles/file/12874321760.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16094d064946af---domixekegajajugag.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/b978dda9098f27cffbc18ff7202b0933/wirubaneti.pdf
    • http://duonglaohanoi.com/userfiles/file/vikisupovijax.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ee605cd39---fefefege.pdf
    • http://yi-xiang-yuan.com/CKEdit/upload/files/wanaminajuxegofufivan.pdf
    • http://aaykpn.com/uploads/editor/files/94369971568.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=hypersensitivity+such+as+food+allergies+and+bee+sting+allergies+are+called
    • 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_off0000f9dd.bin
42daf47583a566e3468562834c9914c30332529d3fc5f34fb210f303f76d42dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 16856 bytes
font_01_sfnt_off000125cb.bin
bafdac3ee3f892a222237126c089356e05ffe8c980613822d5ab28cab00dce40
pdf-font-stream PDF embedded font (sfnt) at offset 0x125CB 11312 bytes
font_02_sfnt_off00013feb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEB 16792 bytes