Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c264c93adb748c…

MALICIOUS

PDF

95.5 KB Created: 2021-09-07 16:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f65c20cd3a8c66e59de8d3f12d6c0014 SHA-1: 3029b2f3e8c358e080ced7f327e53940b4ef3a45 SHA-256: 88c264c93adb748c984885fb4b95c18f8629a3c8a21bd3ffbd230b1cf73d1c29
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm. The presence of embedded JavaScript, flagged by heuristics, suggests the document may attempt to execute malicious code or further obfuscate its malicious intent. ClamAV detection and ML classification strongly support a malicious verdict, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://remobudostol.pl/pliki/kunipazosesijetatutabizu.pdf
    • http://decaldankinh.net/upload/files/35743028085.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/78793f74d02ef750ff67c1233808cac0/lagisa.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b1bdb0a3ee3932a9a3356884efcc9ab8/60990146950.pdf
    • http://domholidays.com/userfiles/file/22921936749.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/ng16c5gvtvru4vfmskgsdsl892/rugotagafa.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1611e85ee2540d---22542880460.pdf
    • https://argumentua.com/i/file/rosupokitexowujuxefu.pdf
    • https://foodphotoshop.com/userfiles/files/nafakusiwu.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/jggo0mnvbbmm4i1ia7478e0qcn/dawesuvasisorusar.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ao252unv56uapql1q7nnrt67ls/21469504208.pdf
    • https://stijsr.com/userfiles/file/21789402593.pdf
    • http://design-klasse.de/ckfinder/userfiles/files/xemefovudetefi.pdf
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/13059061067.pdf
    • http://shengnabei.com/uploadfile/file///2021072107351375.pdf
    • http://elementsgogreen.com/userfiles/file/ratiximunijisomik.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098b5942c9cd---47523435516.pdf
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/vekebaxufozi.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a568ed425a9---53986539165.pdf
    • http://ajisushionline.com/uploads/files/20123436575.pdf
    • https://apc-algercentre.dz/ckfinder/userfiles/files/bugegilo.pdf
    • http://grandviewgroupresort.com/upload/files/gubujiginejepegi.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/a9d9406336ebc5c05802cf063f9e29c7/27597723299.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ts+eamcet+counselling+dates+2018+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_off00010bca.bin
af1dc8dd19f619fb01adb90e584841832bcd96df6ed874a37d614736f4bed5e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCA 18908 bytes
font_01_sfnt_off00013d44.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D44 16792 bytes
font_02_sfnt_off0001555b.bin
786245775cb0c832e15dc2e10b8c4feea4236e4e89c2f1b047b3794121f03b17
pdf-font-stream PDF embedded font (sfnt) at offset 0x1555B 11428 bytes