Malicious PDF — malware analysis report

Static analysis result for SHA-256 00407ab031ea1515…

MALICIOUS

PDF

91.6 KB Created: 2021-09-15 08:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c351c34acf668a1aa931f81c900e5b0 SHA-1: 07c9ca76bfce6cebf011032f6c8d9718b22fcfce SHA-256: 00407ab031ea1515f87875f07a7f07b5d7221eeb85ce8930898983669c768229
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external documents, many hosted on compromised WordPress sites, suggesting a link farm for SEO poisoning or phishing. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://tsydesign.com/userfiles/jws/files/457003798.pdf
    • https://vipbeachhouse.com/uploads/editor/file/57469410085.pdf
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/neretikobazogugowat.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/8f96de6d3b68aaeaf89a51ad1d8e2df2/lobifajab.pdf
    • https://drishtinetcom.in/FCKeditor/file/79086554330.pdf
    • http://studio-castiglioni.com/userfiles/files/94357248785.pdf
    • http://yearbookplus.com/uploads/ckfinder/files/92342181199.pdf
    • https://www.lipca.com/ckfinder/userfiles/files/79987357266.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161405e102caaa---dejuzapamugil.pdf
    • http://citysoupsbellevue.com/uploads/files/lotajozeduzaba.pdf
    • http://posekatzahradu.cz/files/file/4867220558.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161413bee354a2---95071623393.pdf
    • https://jss-moms.si/upload/File/30084928279.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee1cbd6ba3---59762537126.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161314ee06b848---dezuwu.pdf
    • http://rkmaster.ru/uploads/files/dowenaxavibife.pdf
    • https://iwanbim.iwan.co/userfiles/files/24168394560.pdf
    • http://ducthoaudio.com/upload/files/zekuxuguja.pdf
    • http://www.centrosanmarco.eu/img/news/files/javufalikewuwolezu.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fbdf80cf7---19628281630.pdf
    • http://miroslaws.com/ckfinder/userfiles/files/gepavuzekopewegavonete.pdf
    • https://greenfuturevietnam.com/Upload/files/91509940338.pdf
    • http://tech-in.info/bramy/userfiles/file/63782666763.pdf
    • http://tourhong.com/FileData/ckfinder/files/20210913_5FB1C76B3857B01A.pdf
    • http://sirindhorn.net/upload/File/damozesojifixozowalinet.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=cox+email+server+settings+android
    • 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_off00010044.bin
0a37005bd6d02ceeb36058bca39e1e10a8679b1e5c092dfa41d7301d6c4f25f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10044 18180 bytes
font_01_sfnt_off00012f86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F86 16792 bytes
font_02_sfnt_off0001479d.bin
f723be9d374e71dada11ce7587226b334b409ddd4b6fbb85f31aaf7a5ae883ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x1479D 10788 bytes