Malicious PDF — malware analysis report

Static analysis result for SHA-256 4748aed7ba3c3377…

MALICIOUS

PDF

174.0 KB Created: 2021-07-13 17:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b83c0ac8620086b7ab3bc8307a16ac05 SHA-1: cf45680429b5c0ea0af0468bfce97df7951f557c SHA-256: 4748aed7ba3c3377dea75a39e919f66eae7255c934b0e09f8a2969b26177622b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9679

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 http://csc-021.com/userfiles/file/20210627055242_y98vfu.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0099410f5---96795713008.pdf
    • http://rauvuonsach.com/images/uploads/files/dedabazuxekubujamoguvux.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076d85fad47c---49170288789.pdf
    • http://sns.hu/_user/file/gebamukopatamidare.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c064be513a---68514428113.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/db7ff7b1d246fd5c3487e5e1b441b942/1838151707.pdf
    • https://muzeumkonstancina.pl/attachments/file/58841631250.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c636f0027f8---nakerixilifakokimibakud.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf26ce2815---daboxuti.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6ceb6f266---42631855550.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/3f728072c37575f4357e749dd6e50f65/15285253259.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a78525c6209---18440988033.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/22906225284.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095c967f11d3---70070197366.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b319c72bb15---molodexelonikiba.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/fe64212535f0d0d3bb8ee734e34ac9c6/guwale.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1977166f5---miwuvivogopujatofe.pdf
    • http://beveragesgs.com/userfiles/file/kagirupaxajozixebagesem.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860e0be9c70---21302851445.pdf
    • http://atthaya.com/file_media/file_image/file/26515551075.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/7b5346d14ba8c6d6176bc34fb47bba80/49405660568.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/31649297814.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/429d88170267642cf9d50ddb47f8f946/42220259064.pdf
    • https://greenfuturevietnam.com/Upload/files/812236781.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=list+of+super+dragon+ball+heroes+episodes
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d195.bin
9ea237e138a24eb74e8905a17ad03d41924ae19052831d4a7fa5c0b60ba8c3d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D195 18352 bytes
font_01_sfnt_off000200be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x200BE 16792 bytes
font_02_sfnt_off000218d5.bin
05d43fde190e0472b8f868f27868ec534eec5d2c2e81103cd7bc955a069533e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x218D5 10972 bytes
font_03_sfnt_off000231c9.bin
5b1b42a624094709365a866c046953d653efd0000f68fff9dd53538dc25227fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x231C9 43452 bytes

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