Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cdabf72296071fa…

MALICIOUS

PDF

90.9 KB Created: 2021-06-28 10:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 772b8742d59701d6bd9e1d89533c044f SHA-1: 762331d5c82249e27f767f10c6c8c3c69f2ba919 SHA-256: 9cdabf72296071faa736bf20065f676405a0e2899a97b9e1439670ae2e98257b
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://inwebjor.ru/uplcv?utm_term=extreme+body+itching
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/g6dnh7elht6fnlihinot159msg/34382664434.pdf
    • https://clickkedai.com/userfiles/file/10390945004.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847c9c8a2d6---93039232669.pdf
    • http://autodilykanka.cz/cmsimple/images/file/juluded.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/76ab0846e62b061016f8b6da9a5bd15a/85077317186.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e1f86801b---kutavuwalipajepebebabotes.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68297b666---12343107870.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/dd65ae7f35df8cb2935ffcd25b68d140/14638234815.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ade503a5d---zudagejesak.pdf
    • https://wavemed.it/wp-content/plugins/super-forms/uploads/php/files/be78bd7835d2a383d054cdb11f9db8db/fejepalobuwewapuwinu.pdf
    • http://www.knickmeier.net/images/pageimg/file/nerunevezobagogawuwe.pdf
    • http://bwc.lt/i/44222196555.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5c47fdje3uvk64cd6sqov7ibp2/fogosad.pdf
    • http://intrigantka.ru/images/userfiles/file/93428635420.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/85818942bc7eca2f785bb1322cb6df4a/pulumobabudadanokup.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16078ed3fc7713---81710694336.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1253d8b637---kejabar.pdf
    • http://dailitara.lt/bites/uploads/file/96100308274.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7a6199566---gosonujozoxanesoxiruje.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/a0a0c2d47bbc9e4a3f14ee43ba56984b/rofogitetavade.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f1762dd8e---82950344026.pdf
    • http://mooneyes.pl/userfiles/file/27023167723.pdf
    • https://kasihpaham.com/contents//files/53213697842.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ufe39hapkmufm37rjg858mjd60/81692202191.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/d1dcd43a59fd2ba2480f2db59f671764/xaxuxosulabidevo.pdf
    • 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_off00010359.bin
8f371895a56ee680b7621fcfbef3a20c9e50e87e98c8a14c34d07b2981c9114c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10359 10780 bytes
font_01_sfnt_off00011bc4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC4 16792 bytes
font_02_sfnt_off000133d6.bin
29867624772d0d27c0a49d116ddfbe8500f3bb04a17af4b00b6c487e16ebb75f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133D6 16504 bytes

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