Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9b1e7f192ecbef…

MALICIOUS

PDF

87.2 KB Created: 2021-07-23 03:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 60973fe014de31a73e6ce70175729628 SHA-1: 215c97d4ee127477840d3ede0fd8673f3d0a117c SHA-256: fd9b1e7f192ecbeffa15b89c92134cdfd108722013cf663f6d24643174c13a9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/v2779jfrp6iaokaa3clivkqtfq/6809894495.pdf In PDF document text
    • http://studiocalcinoni.com/userfiles/files/66755522029.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/kofadegupasotakufepijori.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/803a1a220bffd60ea7c189030632ce67/28935304830.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b6b1467c7---dosalaponemilafaxugoki.pdfIn PDF document text
    • http://htwy.com/upload/file/guvevugiwumopemida.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1272d5f25---2805544333.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ddf94c2b78663418dc508a6ebe4ea781/tanarosotogatuzilutagejuj.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b64b6475031cfd4d57f107dc4a5193e6/900090669.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/5aa318ee81b84de85bbbc873f2bc66d3/xedaroxev.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/8mf3em6o6gdogqgce8s28fkhcp/tuzuninu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e07d7a7971---wilajawexafavofesu.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/24a78fa45dc1903d8ac41f75aef6af19/67220179880.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089a99a95bc6---17677132753.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/92023436034.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/f789jvjh40qcrm8pmitmbbp2f3/pasubowemikopexo.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/87194233093.pdfIn PDF document text
    • http://cosyromania.com/media/file/ranawifimujutegirumuku.pdfIn PDF document text
    • http://rafaelokazakov.com/file/33050420286.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/ritovatikuwosog.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/janifiligipilanodaz.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/mezedel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=coil+pack+misfirePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 17620 bytes
SHA-256: a26e78edb48197432aac50cff630943fab24957a0793f3bf2c1b50a2ec3a0a2c
font_01_sfnt_off00011f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13756 10560 bytes
SHA-256: 78cdc0402550f340a91fe0dc34fa8458fc06213c8d73b5cde1b3c2c41a708164

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