Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d96ed2d967f3bb…

MALICIOUS

PDF

69.8 KB Created: 2021-09-29 01:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e7316274cd42ec8c97fa30a23d069943 SHA-1: 92b49cb1d2254ed60691cb37db71b608366fb3fd SHA-256: f4d96ed2d967f3bb3fd47435e440ad2701fd10904707381e90bb5a74f16f78ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious websites. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The presence of embedded URLs and the link farm structure suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=eharmony+app+for+android PDF link annotation
    • http://opuspointpartners.com/ckfinder/userfiles/files/vulojepipanovuwizizuv.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/23792765343.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/sosojuzafoveko.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/o1dt4gsr7b06papk4irqbohes1/92846384927.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/betor.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/41487939763.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/84548378739.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141b9b488985---magirisuxek.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613044ed60d40---mopaz.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/nadifamoguxovalalutom.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/razesenimowugoxotiwejulu.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/daranumaserog.pdfIn PDF document text
    • https://tele-video.ru/upload/files/90497095159.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/28881943508.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/qgh0htt8n34bfhoplbt0ghop2p/93462596075.pdfIn PDF document text
    • http://zenkatsu.dk/files/damaxitijifebixil.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/xotonifozake.pdfIn PDF document text
    • http://varvshistoriska.com/file/75838396158.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/dizavigupofosumamaziluvi.pdfIn PDF document text
    • http://knipia.com/userfiles/file/54207679894.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/69127379543.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/15344375877.pdfIn PDF document text
    • http://prestopc.it/upload/file/xemuramevaxufokelekuxok.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_off0000b06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06A 16520 bytes
SHA-256: 820799fa2e65675415f9fc2621e9e419a2c2480db4e8249b8be197f25f2fc0f8
font_01_sfnt_off0000da87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA87 10416 bytes
SHA-256: babb2e6684ebf33d44fa4a53b32f4457fb083aba13395d9bb0cdb9443b3cae96
font_02_sfnt_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1