Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf52970064078d9…

MALICIOUS

PDF

89.1 KB Created: 2021-06-25 20:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46b42f780d2b3150ce65979b441fa206 SHA-1: 9014b9a75ec1ba1fb27c502036919315f393bfcd SHA-256: 7bf52970064078d9d420a97e947058a54d041173bd50531e49433a555b7380da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress installations and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to direct users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://crysiq.ru/uplcv?utm_term=tell+me+about+yourself+with+no+experience+example
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931bb27fc64---37386974456.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/5e655bc5cda99b37a3c1ad4bc7dfd4f7/89028956907.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096c5347936b---62878679120.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/50rvnlq3mpip2hvn7hpuntfnq0/41099905428.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/7d21a98392b79ba60743a38f41a6193b/memixaxemop.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a181b6ac7d6510274c082d399a303414/51960470642.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/d8fba89836d431905c300e7f6686e82b/liparujawuki.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/998bdc5a5649c7c5ca88e880e1a81be9/9024680669.pdf
    • https://poolpoint.be/uploads/file/manufu.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/b0e3b9251c8c565c5bc046b099b0b854/xikomovut.pdf
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/27495892669.pdf
    • https://pypconsultores.mx/userfiles/file/70636638241.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16078a072bbae9---ketusalekifevugabukuzinu.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609425081690b---61420488431.pdf
    • http://autoscuolepintozzi.it/userfiles/files/nitotelewaxuxuju.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/2aj66prg2dptmdt8lqgbj6qn2a/sosar.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160803e0649944---65797569337.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ac597435c2c371dcd51e9445aab2d1b4/82340954597.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16079f49838cfe---37015674483.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16094f9df903b9---54945135245.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16078df3238fe8---pegovuzanobawuzu.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160806e3ad54ef---37158065623.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_off0000f8cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 16792 bytes
font_01_sfnt_off000110e1.bin
13c64812bfc9eb2d2b3002e17eb2fc312a492f95a5e414e89a26b2e640158a31
pdf-font-stream PDF embedded font (sfnt) at offset 0x110E1 16848 bytes
font_02_sfnt_off00013c84.bin
0f521119f7677ba9b3f38357f0709e2b5e93e47a0ec69ef5a400c5ed24cc10ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C84 11252 bytes