Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40f34de3b9e9b0b…

MALICIOUS

PDF

87.0 KB Created: 2021-06-26 10:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4bcef25cb11d3c5f0ea6ed32bd3f78ba SHA-1: 9dab00e6046b260b76702cc06792c4bb6e513299 SHA-256: a40f34de3b9e9b0b5b84511be912bd2d0f1da75dc6c5ea52bbdd3c71448ecb01
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites hosting other PDF files. This behavior is characteristic of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://southtours.com/wp-content/plugins/super-forms/uploads/php/files/btm7fcmlqjqrfc3q8j20ukqvnm/fojidisaxuxoxosa.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a92b66e600---duxibizopi.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0qlrr7a5dop5al6el4igepp2p/lagixenivuwipit.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f89e85d9a---9950501150.pdf
    • https://aradovan.com/userfiles/file/9152681908.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4371f375f5a9249b5b23b1842337f774/fobefiwegewikologojate.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609879ae877bb---rutawukoxaludetajumule.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bsmptmdfkvip063dotalf1ou0l/durubepelenasogujilije.pdf
    • https://akapacha.com/userfiles/file/jizutepajiweteribobaru.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090b7c001e40---xijoximefivogaladujem.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1af85531ca---videlaxujiwasolofojebidaf.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/pu3g3bo29jqc3f2t1skunjpehs/29196558360.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/4b68733f4f997fcb99eb057a5dfd7f8f/kubovezifakewularovesen.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/005e97fdd4656328ca89b0539837e13f/nenexowalemewiwusefura.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608deaef96143---mevopukewavif.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d79aa1e649---91202382227.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021516527397838.pdf
    • http://klefmarken.se/upload/file/fimabab.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c6ed5669adbe181d923854b8f57acd16/97161877635.pdf
    • https://cornwallstaffagency.com/userfiles/file/zuruxusipodikegizowax.pdf
    • https://caribemed.com/userfiles/file/zaladegof.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/f3c3f490c863726f9b0959ff26cdb4d7/65422410730.pdf
    • http://csc0351.com/userfiles/file/20210624000752_ja4ugb.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=reduction+of+order+non+homogeneous
    • 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_off0000f341.bin
ac1719d29caf243922e3d45c6882c66d71a11deef1c38a138065d17247c78435
pdf-font-stream PDF embedded font (sfnt) at offset 0xF341 10860 bytes
font_01_sfnt_off00010bf2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF2 16792 bytes
font_02_sfnt_off00012404.bin
67f1c04e464f95fa8bc27a76e75355dbf47a4332be595afe735cb506c6ee1648
pdf-font-stream PDF embedded font (sfnt) at offset 0x12404 16376 bytes