Malicious PDF — malware analysis report

Static analysis result for SHA-256 985d720a02939567…

MALICIOUS

PDF

104.3 KB Created: 2021-08-10 07:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c4cd3128aa6a484816a169e2b15b75cc SHA-1: f5710a9fcff1702b9d13fd536b26882174764fa8 SHA-256: 985d720a0293956716755cf9fd8f7906001b3c1a484c5ef38913a4639f8d2696
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the presence of external URI heuristics and compromised CMS upload links points to a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://queure.ru/uplcv?utm_term=skinny+guy+gain+weight+reddit PDF link annotation
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16111c8ff9d6f1---fafubunisutapotu.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/82332227156.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/jawajitopug.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160822c5d42c7b---59748379260.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c90c31a7c8---23256536738.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c02f563c6---24115243483.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ff477b3f8---97689187719.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/pomufirusitutiv.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/5756870402.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/10267634098.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/48920393612.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/m572uqvqa7pnf6e0jvb3ombm1f/dadenuzozurefidawaj.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/dawedazufem.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5699eb35e---93636437627.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a3dd1f3a273c4102342d5cab6884d8fd/mufarogadapitawabunaxiges.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607022b809866---97915905757.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/78506527305236c6e9909608ab5a5afe/murepuluzal.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f16e6d90aa---49849331316.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/3237267995.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160cac72c9bb4a---xudibobikurabaterugejavos.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/77129679026.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/kikapisinizuf.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/70583871220.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210616095617.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/35094799855.pdfIn PDF document text
    • 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_off00013388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13388 10660 bytes
SHA-256: 3e36995091c3df8d1b01706831b45792408746a8aa2175bb772b2dba37c7a801
font_01_sfnt_off00014bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC4 17712 bytes
SHA-256: 3f693a7aad6a419c9ff1c4feb4cdbe524fc4110f0cadad487bfdc20910f4922f
font_02_sfnt_off0001798f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1798F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1