Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2dd8bdd4e9c0adf…

MALICIOUS

PDF

87.3 KB Created: 2021-09-01 02:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 39553ca33c46f4f866dcb9ecb7cbfd82 SHA-1: 1fb84368e5dcf768165fe09893d0abb90fbbefd3 SHA-256: a2dd8bdd4e9c0adf99af49012e6dfd5664a06db86e2b00ca4e82b1a23237c811
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage lure or distribution mechanism. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://robinio.de/wp-content/plugins/super-forms/uploads/php/files/7o9taiscsjavnfbsi5l66qtcf3/janazedowogenofepe.pdf In PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/fed39c089be88a18260126f9fef759d3/tekurokoxerikodaziz.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/81810529630.pdfIn PDF document text
    • https://chp-travel.ir/data/file/xotiwiveluzesubivaxov.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6a230b580---vapevas.pdfIn PDF document text
    • https://tsegypt.com/file/jixixuwasafibesateduxefi.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/zekijifufinivejivibu.pdfIn PDF document text
    • https://hoalavender.net/upload/files/80165422319.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/5c1cacfee3e8770573594220d3fb9794/38738173477.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/gafup.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081224fbade5---lesaxop.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/ca8e0ba85e44a19047f6b3fd6008b687/rowunelasulujalakiz.pdfIn PDF document text
    • http://zatacorp.com/upload/files/zemebuwujafexaxulexo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b4df492c1c7af094a084cbf6eb823077/3944031369.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/sutipuzexanat.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ef2c0dea5f3fc2344dc2d4d6d8e18d58/lasad.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608a103e3930b---3943645418.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/gegerowukikepudewowij.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/13803442647.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/judureri.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/64611158372.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/cbe6d061d6592524b4fafc47d57e7260/94576627547.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/def24c7d75e6d74ef199db5d58f7145c/59028244130.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d876acb6010---jukupulabutujezagiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+does+data+ingestion+meanPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10622 19008 bytes
SHA-256: 97cfbb419c8edd691aff5ad189729dd54b998b03851e6e1a4cf106be32cc1e8a
font_02_sfnt_off000136dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DC 10544 bytes
SHA-256: 84989df54ec49cccb2fcb81532a1328c70cc2a2e9e9148f24df7c97164a2a46a