Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca75746a7a5d000…

MALICIOUS

PDF

86.9 KB Created: 2021-09-04 13:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d24cdd1e7abcd2a976ae4bde40db7284 SHA-1: d1b5b572b5cc7f29b52bea3beb99cf62eb7256f3 SHA-256: 7ca75746a7a5d000785ede8eeb245a00393489ec75ac486c65ca524280a9119c
156 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and embedded links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking readable content but reinforcing the nature of the file as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://infrive.ru/uplcv?utm_term=kasie+west+by+your+side+pdf+espa%C3%B1ol PDF link annotation
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973c1580a79---redenudosaruvubo.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/tivimopirebefemokag.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/dovenusotipe.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764ee28df92---zizepasuladinifuxomu.pdfIn PDF document text
    • http://allasclub.com/campannas/file/44241525742.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8b7927f69---japoburasukesatudijipab.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/797530856.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/9cf0896dcbe7577977ffdc1732075900/43115568930.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/18914545315.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/31476449407.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/83001845076.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b1a282aec---13566153602.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736e0872201---20273679946.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/68125053837.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/c4f1c842cf97cd715ec896dcacbcd1ed/kozagigoxebomenujakedadiz.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/12630028993.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/numupefabotavogubuj.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a738574eac16cc7202b63463dcc3d42b/72729321469.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/44110529159.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/i3gmrhe9e8l3mvr7jgqpaf6qcu/pinulokajuduzefiji.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c7272732f---10236342765.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/deguramuxibokujebiriz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 11024 bytes
SHA-256: 140354bf8b617c0e3456b47ff205ef10ed82291f6a08d4be7c36e8703bfb1ac6
font_01_sfnt_off0001035f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 18660 bytes
SHA-256: c7f0c212c7d09110ac9b6abcafb877426f0158161b5e7c1541fcf0887e545bd1
font_02_sfnt_off0001339f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1