Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67eaacd8739ae45…

MALICIOUS

PDF

84.0 KB Created: 2021-07-08 09:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29e1f9379f2f44b37114058125e4b77b SHA-1: 2ebf54446e166cf47138cc6c3933acf93d136aa1 SHA-256: c67eaacd8739ae4589799bdf2b9fa84b31ddf5384d343ff286b1c4ab51af5613
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also assigned a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/2333c3588a86dd68a86dd59e8f752c9c/pezadu.pdf
    • https://foundryindia.org/userfiles/file/87703400517.pdf
    • http://filtrydokoparek.pl/img/all/nijovamefoxipi.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/44210759810.pdf
    • http://ropesadventure.com/d/files/84805272975.pdf
    • https://htddienstverlening.nl/userfiles/file/53303086837.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f48c26c96---75566946651.pdf
    • http://thunderstar.cn/userfiles/file/20210501202159842226822.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/d9f2bffc8920e1f1a38fca93815dffd4/74745827072.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f39e588077---boxosubezevoja.pdf
    • http://vizesblokk.hu/files/file/82673483271.pdf
    • http://ruilong-ironwork.com/CKEdit/upload/files/kajaxexef.pdf
    • https://akapacha.com/userfiles/file/46503589168.pdf
    • http://gursakaryahukuk.com/images/file/57270784828.pdf
    • http://bagiez.com/userfiles/file/xejuwij.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/a6ae7436fd41e62bfe5eb61a76317e04/zawilineravugasuwusa.pdf
    • https://mszukam.pl/dat//file/83390705795.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608840c2d6bfe---35805462545.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12a91cb89e---76809314240.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76ceaba425---36691497802.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/hj7dtuhibhuf6u3npif2lhg55a/kojarewovoporinaluxaz.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2ed5b9c7a---46506605468.pdf
    • http://akcjonariusz.com/UserFiles/file/65253995929.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=shoranur+assembly+constituency
    • 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_off0000e3b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 16792 bytes
font_01_sfnt_off0000fbc7.bin
52753b093a51e9ec2a92c0a4fc6bc0a46026fde0ad73c36a8992b4d2c4141b42
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC7 10924 bytes
font_02_sfnt_off000114e9.bin
959acd06914efeac05398503ef1c71e5df0db393889427971676e991be39a241
pdf-font-stream PDF embedded font (sfnt) at offset 0x114E9 17308 bytes