Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b9bfd6cf5c54d6…

MALICIOUS

PDF

117.7 KB Created: 2021-07-02 21:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 538680af2c9cfbf8bde1b474ac788228 SHA-1: 22388f7ed0b0841f7bcbfcc28f0f8b4aafea815b SHA-256: a9b9bfd6cf5c54d6467f517a851a91dfbba2a3164ef6557ee1995ba1e2526bfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pixomot.ru/uplcv?utm_term=second+order+difference PDF link annotation
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91455caf3---84995806341.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160799ada3897d---gusava.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7a49489e3---sanogajarabedalofusimi.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/vuwusoxepes.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20216264112725.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/uuhp5t648s36u778f8ugol4pa1/98163518653.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/f08c5fd83c6a23369067c447a9d2f68a/46325989634.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8f420ba31---75939928620.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070850f0b530---datikodifodemawoditive.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/50223818063.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/42890914338.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/segokisoxurowopi.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/melokegipesibobazere.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c612ea9dbd3---86446447979.pdfIn PDF document text
    • http://stevis.cz/files/file/mavitelovogapewovudo.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/47936854406.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/5eedkf01d9aom0evnd73j5l4se/tubijikenolekoxijavojib.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/730593471.pdfIn PDF document text
    • https://vieiras.pt/imagensprodutos/file/95542131198.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/d7e6a6d9f97ed1a8196193b7ba6f4aeb/dufapimifa.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7189ecf76---33879204646.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/3716294648.pdfIn PDF document text
    • 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_off00014d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001656c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1656C 10068 bytes
SHA-256: 5911846ab8af88b25615205277c2523e0356441978144cf014d0be7012cc680d
font_02_sfnt_off00017be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BE6 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_03_sfnt_off0001910e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1910E 20680 bytes
SHA-256: 9ab0b2de1c5d1e54671bd4439e04794ed866c9f45739110769e502eecfc34297

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