Malicious PDF — malware analysis report

Static analysis result for SHA-256 7daa30eea97b1ce9…

MALICIOUS

PDF

84.7 KB Created: 2021-08-12 03:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34b3add38841373abf179bbd23b4b0c2 SHA-1: ec911c820e1c0896c156d5e5adacb13f164a213c SHA-256: 7daa30eea97b1ce94e317ff454a46860adb099b7db5916f88a78ebf91be55b58
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The sample also functions as a link farm, pointing to numerous external URLs hosted on compromised WordPress sites and other disposable domains. These links likely serve as lures for phishing or to download additional malicious payloads, as indicated by the ClamAV detection and ML classifier.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/puxitawi.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/26913462671b69c41c8b7b266415eaf8/nifamufakilebup.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161135022df2e0---ditaborifi.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/hb42ovpfsun474pbda1v3rgfk6/dosagatos.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848b8056b3c---88705543116.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/61f897ff4c2b2fd2e2d276054b24b6d1/sabosa.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a40d543f842---zegagakevopoveke.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/af3r19kajf4v5oa9cregghrlb7/powokupeget.pdf
    • http://doo-san.com/userfiles/file/20210721014730.pdf
    • https://asthasupermarket.com/userfiles/file/tagida.pdf
    • http://oreade-breche.fr/userfiles/file/86458288232.pdf
    • https://hopadive.cz/ckfinder/userfiles/files/73855459431.pdf
    • https://dansobentre.net/uploads/file/bolafad.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/1875260fa84037e73ad2349cad135641/44314841476.pdf
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210603094744716390gprhjj.pdf
    • http://xn----dtbfdwc0aaaev8k.xn--p1ai/ckfinder/userfiles/files/botujuraxolirodatojilike.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d44768ea09---42786943923.pdf
    • http://446888.top/userfiles/file/kidefizugumavirikavebox.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/up45g6jgdr13s6rn3rjrqgpn68/majemaravevurefaxojot.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/bumokufenalowaw.pdf
    • https://superpart.com/files/11249202691.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ventajas+y+desventajas+del+metodo+inventarios+perpetuos
    • 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_off0000e5e4.bin
b9ef26c008cfee5fcaf78af028a230e4d630c0de41f7d5c3610ec191f1a359f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E4 10932 bytes
font_01_sfnt_off0000ff32.bin
30697cc196a80da9f2b3d753ba74f022df69e924b3337993679ad1bb017f07f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF32 17308 bytes
font_02_sfnt_off00012afa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFA 16792 bytes