Malicious PDF — malware analysis report

Static analysis result for SHA-256 e694aceeec129d06…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 06:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c5620f4ba0d9bf728ec42ba2244817fd SHA-1: 7e3822931499e53bef1b46f352cafef4b29067e5 SHA-256: e694aceeec129d066ea69b835df795ba0399cf2fec7969415efff1880fa6062f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed to manipulate search engine results or redirect users through a chain of links, likely leading to phishing or malware. No scripts were extracted, but the structure and heuristics point to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344cfd5da1b---xavaf.pdf In PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/diwugisuromofobu.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/vafbd06cp501akug3fbcmu4ksu/daxigelubamopuwekados.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/jeruvokudiwagulaxowu.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/kedivugurizok.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/71562977671.pdfIn PDF document text
    • https://hotelcorona.ro/files/7291450982.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/99929377836.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161450d7dd12bf---20083270832.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/gonezozijo.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/35140771569.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/30833900772.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/78875616455.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/gevowojomijilixaromide.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/vatiwufol.pdfIn PDF document text
    • https://citytrafik.nu/images/file/3718806036.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/48870843392.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/83033852821.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/tibolaj.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/wuzifizinukaxomarega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mp4+gujarati+movie+downloadPDF 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_off0000d583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED95 19088 bytes
SHA-256: 8b4cf455762f166c0c3f2121da1c24f8dbf824c2707f86fd3e6fac5e60d4f204
font_02_sfnt_off00011fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA0 11020 bytes
SHA-256: f3ee5ef925a7d4f79812150dbf5b3122a2a74358104124f6157a78d3131c87d4