Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ddf078cbc73fc6b…

MALICIOUS

PDF

101.8 KB Created: 2021-08-08 13:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f0727b53cefd2ceea7ed4887382c6eb9 SHA-1: f7c3109bf16726ccbf8c07a7915da7280cfe2a0f SHA-256: 4ddf078cbc73fc6b3571f40cac2027d82b5361329e380cb06a6be3afabe92cb0
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and other potentially malicious domains. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/b43353268bb5d0d33505a56f73d15c0c/netujup.pdf In PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/a210530a07b5389cc025c0be6877f285/85318888140.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dee228905---22747952371.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/41251802018.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/powagufizalafuli.pdfIn PDF document text
    • http://geodez.com/pliki/file/40368526111.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/2ei3oohb37tvblusce9sfs92gb/62173372338.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba62d89c4b6---wagos.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc205e2f584---nanugodovuwononinisexome.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/dekafexemu.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/21852487861.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/2f313c8004ba841dba828a2208c5eb67/53897005762.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ogufivubopaxiwomimudoji.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/wuwolumativamu.pdfIn PDF document text
    • http://miracleschoolministries.com/survey/userfiles/files/20165419841.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/6370630f69a8cebdfbb9bb15298fafb0/wabotekekifa.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d1bec983e---movojimaruvowavoxesitif.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/vilugozituweket.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b610ab4ce---gozodogerazasonegeki.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/zowojamiwubifu.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/65de4084a0aa1ee52cc4684e901a6aa2/25554511253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=angry+birds+unblocked+google+sitesPDF 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_off000119d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D9 21132 bytes
SHA-256: 45596653d20a08a6366affb7a2d1be242415abca89da4340fe6080d0cfb56fd1
font_01_sfnt_off00014eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000166bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166BD 1932 bytes
SHA-256: 78b0a163e4eaea4fd1c276a6e09b3ffe8714eb7cdf5cd8e6d31ca7f4d18684d2
font_03_sfnt_off00016fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FA4 10812 bytes
SHA-256: 361b2707bd93754483a310201c3e5ab811ae597c3c3d6203a632fe14f56b6665

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