Malicious PDF — malware analysis report

Static analysis result for SHA-256 721130d28f07a729…

MALICIOUS

PDF

178.0 KB Created: 2021-06-29 01:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a05f1f06e5943ad7a00cb0a6298cb1f7 SHA-1: f1753b1fab48fda26c8bcb32fb8202c1c329cfc8 SHA-256: 721130d28f07a7295e9d540b97c8941196525b03652a2f05bafac76138582e8c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS platforms or disposable domains. The primary goal appears to be redirecting users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/48587018929.pdf In PDF document text
    • http://vladjurnalist.ru/archive/file/boxuvadijisimi.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/l6d67sbj7ekhf3h2kl7hp5s95i/74486049615.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73efac7a08---tidawusitibokebasabe.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc99d70f3b---zunatogawinegarija.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c67e2b9514---gadodosajadaje.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1624648406.pdfIn PDF document text
    • http://artside.org/data/temp/file/3607478828.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/38501508002.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/topidikovowemodaxeka.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/0cc078fa1055784e16fde71179934c35/vazuxowewafupawemem.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc143a6a45e---finejulaxiwegixej.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804023a9bf6---manunotisawigirujek.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9a8fbbe16---podinugipaga.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f88b79c08---23699674928.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/84761c9f019e99efe51e1747c139a855/44548146565.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/26942837104.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/kikubetijaka.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/julazexigegisurulufufonak.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bd8d92ded---dudoganibiju.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/n1mo6md71mqpq7kfbio155825l/19688534568.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23101bea75---60861707090.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd81f37a59---fasiralunugikuzovororob.pdfIn PDF document text
    • http://talleresjpg.es/img/file/rakevora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=mars+when+i+was+your+manPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 17428 bytes
SHA-256: 154df728794ee2796fb69ef8991d437a285179dae4f97d20b7c887b80b1e2381
font_01_sfnt_off00011d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13518 10520 bytes
SHA-256: 54aea69fe493763be51054125a47f67c3c13839f4cbbaeba78c4e15555e55120
font_03_sfnt_off00014ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE6 148412 bytes
SHA-256: c602ffbe987d3ebaf95500647c12302131a8fd0644e3a5767dbf6f273223515c