Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d723a39eb9f3ac0…

MALICIOUS

PDF

77.7 KB Created: 2021-09-05 04:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 773ecc92b08e9b135b49c9f6f15fa846 SHA-1: d1282ce854e64890405ba2c11d029acf4b7aaa82 SHA-256: 1d723a39eb9f3ac0a0e526f6f3b4a50c798c83b2add22e502b44938d4001bd19
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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.x454.com/wp-content/plugins/super-forms/uploads/php/files/hkrt0vom5onktimvd7ehf7p371/91232023644.pdf In PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f884ac6f7e---23249468611.pdfIn PDF document text
    • http://wenxuezj.com/images/File/53595723168.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a5e38e0729---xifezupudevedo.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/mowovijaledu.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/nelalowebotenabujudi.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/rodadedov.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/53910319048.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d88444edd498f7bed7435e81a2196915/dubawiwekuwekeb.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/914570e709a816c31a5e6d28737c0422/judubitizis.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607590cd194dc---koses.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c30f3bc8cfd1c1d59124419b611c22ec/97155521222.pdfIn PDF document text
    • https://guijek.com/userfiles/file/35832822686.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/72821752883.pdfIn PDF document text
    • https://zhansq.cn/upload/file/seguzoditu.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160828ac203ed6---vover.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/xasugamulubudurevuk.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e37a562a5---85416523328.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c562ece09f7---gibojuwanafuvila.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210710195229.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/wuvoteji.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/refakifufepij.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9096e93a0---medelibuvaseliwa.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/vafibamagowaruguvifajafo.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/t6etn4efbbd19cu98hk0uv8p1p/kofijujufevo.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/jugis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=hoopp+employer+manualPDF 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_off0000cce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE1 17544 bytes
SHA-256: aead5997a5d256c3bb351b4f29a67a972b67a70b7c02e3ab1efc650d2891647c
font_01_sfnt_off0000fa23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA23 10260 bytes
SHA-256: 6993c45ed6406185486032ed4efa8fdad541f1f785658c1956ca08a79ceb2b0b
font_02_sfnt_off0001111d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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