Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5747ea77b004ad9…

MALICIOUS

PDF

103.1 KB Created: 2021-07-13 20:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25134e8ffb7199c6c1859783ff952ef7 SHA-1: 8cce61c9ab56ec8183dfda4bd99004aace50d1c8 SHA-256: c5747ea77b004ad9f79bcf70672e25d79fe9ae5d479eada04fe6283a900407c0
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c25edb4b---62172874810.pdf
    • http://silesiacapital.eu/data/file/bedujalugopubidofulapi.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef477d9264---7478882415.pdf
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/vusepudunidu.pdf
    • https://lienlacanien.com/img_pages/file/70223045544.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/501175bf0ca764986fdf9c578ea1587d/94051698656.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/2efc6f6d3427ab37e3f7b57b8c262a54/jivavalogunigozoweroduk.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/2a172b58d23d4675b7d3c529be42f8df/vilewe.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/9e1bde16da52a3b7f1eb39eddb32c88c/35616951313.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609e42f51baa4---30519470628.pdf
    • http://seventyfirstclassof69.com/clients/60772/File/gakunare.pdf
    • https://zapret-rf.org/web/img/podborky/files/97744649682.pdf
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/35029130757.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ncm4gbocjbrhhbiui2hmajhfk2/bozurotibuwatoxuzizezagu.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/0daf92476b960329e789c33d0848e158/nonititibegelezizuder.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af59fe8b6e1---9449614274.pdf
    • http://stellamaris.cz/userfiles/dixagoxo.pdf
    • http://vimbark.sk/editor_uploads/files/47450618709.pdf
    • http://acmemask.com/upfiles/editor/files/79925472583.pdf
    • http://amirafouad.com/uploaded_files/file/rusarudawamenug.pdf
    • http://apsons.eu/files/file/rodewelejum.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc77ec47a0---16240023570.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b49987174---sesidulo.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b4521e68e21---buxapinuwef.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=chronic+phenytoin+therapy
    • 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_off00013358.bin
5b6f8572872a0509d6f9be0f3854a8f358f3e7cf63adcdbda360a88f7115413d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13358 16864 bytes
font_01_sfnt_off00015f6a.bin
b1b69de30805fc330b72ed053070b9a0fc7d8ae74e69e4c966fdcec1248f056c
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F6A 10404 bytes
font_02_sfnt_off000176f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x176F3 16792 bytes