Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a913fd2c7f77f28…

MALICIOUS

PDF

81.3 KB Created: 2021-08-16 16:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 853894f4266ff4ccd40b9ebb1193abd4 SHA-1: 13b924d2feb7f23a943f7df50a301303196c280f SHA-256: 0a913fd2c7f77f2804b075634225b807b1757c721969f46eaf24950e6e8ff0ba
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple links on disposable or compromised hosting suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/85743870299.pdf In PDF document text
    • http://sanruou.com/app/webroot/uploads/files/9479095339.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/17583567665.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/52162094704.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/5262479ca50a1f11d0418b2dd02086b0/45177497459.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/f79d746de0fc9670c230a878e9a05549/74486483274.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/adbb5ef43293dfcab1b5e4be8d956fb4/58287898405.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/6529178969.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/a8bc5c602020dc93563b25420900b5ab/nokonadukigilabin.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5debc9b2da---72437063739.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8ff862427---jirubuxeneduxakutojawaden.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/39359196037.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/vonekunebe.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/8249505598.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a220ba2b577---fobem.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/norejitugonawuxibave.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/afvr39g766dfaqa0jafbk9b6g6/sakojegojagomexibeboj.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a23e439945---pojelepogijunemas.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/526085187.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/18423123211.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/007451ae62bd934b7d6f49bf515a8200/lezufunoba.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/70075648400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=thanimai+kadhal+album+video+song+download+1080pPDF 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_off0000d9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A7 16608 bytes
SHA-256: 4336dc24d21be12a14acf083005b897958d75a26c32055c43a3e0e92ffb56a16
font_01_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 11468 bytes
SHA-256: 89a3eeb88acfc4f1424e38ff048dc534a0ec4a07a5d4aa59e86f3efb2d257d0b
font_02_sfnt_off00011f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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