Malicious PDF — malware analysis report

Static analysis result for SHA-256 8379d064b2ffbb9b…

MALICIOUS

PDF

79.4 KB Created: 2021-09-14 04:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ecb7e768cb82a6e93e35757bf03440e3 SHA-1: 1777cf504e6af710bc4bd9d0decef8f5f9432402 SHA-256: 8379d064b2ffbb9bd374a7b8b7dea9ebdffedd98099d9e3dabba4802ec8bb9cc
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous URLs, many hosted on WordPress installations with formcraft plugins, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ddc-touggourt.dz/ar/files/gipoza.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161329869396f3---risevutoju.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6859f1026---xelujopuxosagoxatadoxo.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161302e1019b23---zobokijikafebow.pdf
    • http://hyunsin.net/userfiles/file/zitilibipodasag.pdf
    • https://taksis.lv/taksis/userfiles/file/29435229216.pdf
    • https://mamalight.net/business_school/uploads/file/16708260415.pdf
    • https://thefertilizerequipment.com/d/files/ladoxeje.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/j20u88f6ms948965hvt3llv365/76026542396.pdf
    • http://panel2conso.com/userfiles/file/95194688107.pdf
    • http://hooleihomes.com/cms_images/file/kikanelesola.pdf
    • http://youzedu.com/ckimages/files/20210907224800107278.pdf
    • http://nanoscopy.ru/uploads/files/zusadale.pdf
    • https://jss-moms.si/upload/File/wumamixuxuvidiboki.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe0e1b0b06---41500513747.pdf
    • http://alacarte-husum.de/userfiles/file/90194901657.pdf
    • http://oodow.cn/upload/file/210912152315895402gp6x3bwabjs5.pdf
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/23403947152.pdf
    • https://ytdrive.com/CKEdit/upload/files/58527355483.pdf
    • http://analhospital.net/file/files/fazorenirepizasomam.pdf
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/jirurilujabifedid.pdf
    • http://roomyab.ir/basefile/roomyabir/files/wokopaxo.pdf
    • http://uni-farm.pl/ckfinder/userfiles/files/91107756153.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=outlook+web+app+save+email+as+file
    • 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_off0000d1a5.bin
bd1cb5e46f746f53e6bbdd77513927e8c8bdd2167529381ffd697653840c9b30
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A5 10824 bytes
font_01_sfnt_off0000ea8d.bin
88cacce233843322e6f0baa5e427f3cac5bfe33d644475b263184c045660bb07
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 17532 bytes
font_02_sfnt_off0001183a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1183A 16792 bytes