Malicious PDF — malware analysis report

Static analysis result for SHA-256 841f112ef8cf6c12…

MALICIOUS

PDF

112.0 KB Created: 2021-07-21 16:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f47138421df0b4a72a385765ab47b23 SHA-1: c9fc9949890e6ec2ab6d97a0b3ffe3e3c2e14804 SHA-256: 841f112ef8cf6c125c10252ec237adb9840de3981f7d68c482a6f9f789c4e07f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs and heuristic firings point to a malicious document designed to redirect users to potentially harmful content.

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://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/79d19fdd4cb87a1bbee83e8a89059214/didiviruza.pdf In PDF document text
    • http://sharon-barron.com/userfiles/files/59644044081.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad755dc02---75529246717.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vegajisax.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdba5acf15---20300932554.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/b42b7e292043ae5cd4583f0d6e2d7f40/xudidujesubidojutuse.pdfIn PDF document text
    • http://learningkey.org/userfiles/91323955305.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/71423319294.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/jemepoxadulatorokufuxu.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e968df17b---49590654195.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/7565e65dc6566326fcb6671fe2f9a132/39274847227.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/73738236602.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/2932616b82725c21b52b110c0a57a9d2/zetegidufoxuk.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e50b9eccb66---11660704373.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c088dc8d5fbde8c4295b3df64f068515/kalug.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dd3392e42---62442032058.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/vavatagopo.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609421ebf21ae---44509513765.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/dunuro.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/pizulodarozoverile.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609496b2c215b---mazufigajaxodofijon.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85a071f92---xojuzib.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071e435a06ba---rudarogidejoxaxoraziketo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=atomic+number+of+all+elements+pdfPDF 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_off00014e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16674 11000 bytes
SHA-256: 0c38a336390d31e1383e4fe794ea6fd537db520508c795f40e11939c464bf527
font_02_sfnt_off00017fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FC0 19432 bytes
SHA-256: 1d504eae51e4207054a97ea84486891a5d896d265a6ea65258baf61961cf0642

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