Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d7bacd47a6d607…

MALICIOUS

PDF

155.3 KB Created: 2021-07-13 17:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e6de8460308fd4e0f6f165ce45f9e6fe SHA-1: d2c0f66f535673c439c1a20ad578fd8a0657d158 SHA-256: d7d7bacd47a6d6078fe818ef0363b6d217f03c31adefe5f69f1201b8555db37f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely designed to trick users into downloading malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/94937afd00437955ed88ea910d89c34e/98851574102.pdf In PDF document text
    • http://autohondl.cz/userfiles/file/xomapezazuzopinizufa.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/pojufusalasem.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893826157c7---batawutumiwapevineb.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/buzodoxoxej.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/g1bk905p5226aokc9kjvqpmb0c/911108670.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/73047e0b07a06b04311f885f302f9bfd/36714714661.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/03k6jvjt2lbcal1s3m8b42bc7t/kifozodozuda.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d09cd1c14---42583967217.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/98590657211.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/kubosulire.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078606bc8836---diwafimuroxigogux.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/kusapevi.pdfIn PDF document text
    • http://ledson.ru/upload_picture/88780881748.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d860f75256e97f2cfef58b6b7bd58893/41204263344.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/nusarizupijav.pdfIn PDF document text
    • https://noddy.nu/images/file/55941195786.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebfb1ce52f---xamujezadi.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/4869883190.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/posazemezidi.pdfIn PDF document text
    • http://groupkaishan.com/d/files/repegugego.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/tipopojazajatewowibu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608264138fea4---zekepusiw.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/bigobuvepigabizosu.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c27052ed9f---55957877113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=caste+book+table+of+contentsPDF 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_off0001ffd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FFD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000217ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x217EF 10400 bytes
SHA-256: 3a900683dcd0a527742854f412611af15f21bf1c0a70bce4fc7bb359459adbd8
font_02_sfnt_off00022faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22FAF 18400 bytes
SHA-256: c4c0d222a673af4c2b7cffed5da23a794254efeca19973fd1508510a37dd8ccb