Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d078a07090926f8…

MALICIOUS

PDF

75.7 KB Created: 2021-07-04 23:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e72ab34238388b29da5dc75d5b7291f2 SHA-1: f5f876a84090f33d565c81a99b46b3fa439e040c SHA-256: 1d078a07090926f8cd2fdb3d75873bc088a40f994402a366750d95369d595edc
156 Risk Score

Malware Insights

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

The PDF file 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 file's purpose appears to be to lure users into clicking these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/45b8f3f4f2f4fc81fd9c3574e8db9f66/tuwoxujoda.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a02c05a7da---giroroguligavarisale.pdf
    • https://folklorebridge.eu/uploads/pictures/files/98001267772.pdf
    • http://whatdwellswithin.com/file/44634804919.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/83262d3051b06415c49c22eb4acc67f1/najilafuw.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/471f461c1ccc5c94ad8f5e2c312f9c94/31913838079.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844212a045b---kemasitamumalo.pdf
    • http://fritz-fahrlaender.ch/download/zikawatogorenoke.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8def1f8f0---kobisibejube.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d15c5e1457---kesipotamutegekivo.pdf
    • http://www.aqsclimited.com/EditorImages/file/17029590735.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ada25cdd4---warowapilo.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dde118a81d---60729534389.pdf
    • http://adabaskimerkezi.com/upload/file/66483588165.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609772ff995d1---kigexurogidigubinu.pdf
    • http://ottotech.center/userfiles/file/wamipuzogigojisejerelix.pdf
    • https://afayl.com/userfiles/file/lewoxilofavegur.pdf
    • http://al-bandak.com/userfiles/file/pozefipiximogomawe.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6838317da4---bapodekuveribexobetati.pdf
    • http://atenngo.com/admin/sites/site/documents/ragiduzitof.pdf
    • http://www.anclupnapoli.it/userfiles/file/30366474131.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/zatavopojuboximexirari.pdf
    • http://www.gabrielamaciel.net/images/content/file/57456752178.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dfca4bdd5---87553088123.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/mifjfsr53f6mg3lblo0mlbong7/73228786714.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=words+that+start+with+as
    • 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_off0000c5a5.bin
59559f0bfc163a67c55c3d80363acdbe00dfe9d6174ad29bba193f8e2d959b14
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A5 16640 bytes
font_01_sfnt_off0000f0f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 16792 bytes
font_02_sfnt_off0001090c.bin
fe98f853f069f40a7a073d461c320341cef7f61346070ad74d83460daa284b15
pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 10144 bytes