Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ae4aebf2785d79…

MALICIOUS

PDF

100.4 KB Created: 2021-08-12 01:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7ce33b1610b9909b9d7f2e3bd35c42ba SHA-1: 1f3c0b0f1f1e2295b19ab096252ef2acb1828b74 SHA-256: 52ae4aebf2785d7974dc9d1d76ac349b8397e6617745a1e789381872111b1363
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this document is designed to funnel users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098a5f37730a---82691832444.pdf In PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160733ff0086fb---xonejananusuge.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/62512061900.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/jopas.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/32907230371.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/pasarajuwowotemapuwed.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/lofisemufu.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/6cf043513ede184a5c4c7452e998e3fa/gaxuvedukaburotagejopufeb.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16110ba6966d63---tavegoxu.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/sipogirinutosirelofidufeb.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6239004a5---47259504807.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/20626936135.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/94f1109ad0fd510529f5932ab855a606/3178459512.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5aa472545f---jifejuduwajoravis.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/runubisexonigulovafopowa.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/29267069229.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/cbae1580f7827c7de94ae4ce203e51eb/64969092511.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/43916819913.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/tgshppjab5q7mfjfra60ldbh6c/zeleluxeji.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/rilebomezili.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/84948499835.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/74506561002.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b60fc73d68c---78880252160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=amt+2019+maths+challenge+junior+answersPDF 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

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_off00011e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1A 18368 bytes
SHA-256: 596195773d4b347208bc760be7a71eefcc4f3e8fb1ed81e00ea2a32b8b889fa3
font_01_sfnt_off00014e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001667f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1667F 11436 bytes
SHA-256: 8bf7c3ad3b52a6fbb2077dd218995189308b4f04c6e411cfd5f1529edf2502a7

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