Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ddfa0a87d184f4…

MALICIOUS

PDF

71.3 KB Created: 2021-10-01 02:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c78327900d2103c73432105573b74fb0 SHA-1: 45996c582b3fe3e732f852ef1ca55d357960bdf7 SHA-256: 26ddfa0a87d184f47b15407ede70eb1dadc1269108350ad8f703bd9ceae90ac5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised websites or are part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The file's structure and heuristic firings suggest it's designed to lure users to external sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://fkhd.cz/data/img/lefebulivogizogobesa.pdf In PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/97639431618.pdfIn PDF document text
    • https://bselink.com/userfiles/file/29942446210.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/re9peaaa11irej3vacdobqhg2i/devopemesukovumaxanesomik.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/95298438269.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/50463732640.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/83350149043.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/28313538774.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/gotinix.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109251757564148.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/82535173326.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/detejapoxoma.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/84945418380.pdfIn PDF document text
    • https://fong-cai.com/upload/files/pikes.pdfIn PDF document text
    • http://elitacasa.it/images/file/53363884988.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/sb82n2qh6q3ld8famfc5kjmg5u/1541732047.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/davepiliwukipusativigev.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/68168828792.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/sunapuw.pdfIn PDF document text
    • http://venkateshservices.com/uploads/64656051824.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/vogefezelu.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137b49eb8c15---dunusodosabinetinurufalir.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/julikeborokepilifat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cooking+chef+food+fever+gamePDF 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_off0000b517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2E 10800 bytes
SHA-256: 2549b8f39b52e48abed64e203380c9a2dc6d272efbec33aa609a2cd6a9a24fd6
font_02_sfnt_off0000e5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B9 16480 bytes
SHA-256: 87cc7f950462c6f3daddc271b6270a5a7f84adee1aac1a6933ab5f526b2e75d0