Malicious PDF — malware analysis report

Static analysis result for SHA-256 86774fa92e196641…

MALICIOUS

PDF

84.0 KB Created: 2021-09-13 08:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 067128e4a9072cbe94d60b9b89510996 SHA-1: 34f4ee1b69104015a611a91a1ddfc88aa4a43010 SHA-256: 86774fa92e1966410f2dd28719522c5594711aa5fc1e42971354a881d558ccd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://jooli.ru/ckfinder/userfiles/files/ferazurufetimijugokufu.pdf In PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/33410316196.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/24023647219.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/39920182414.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631433875.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/93065519884.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/renivotezu.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/gonifax.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/30vj1a46snkbjn4un64hmklqq0/bizaxatasomavabi.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/pukajeje.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/70429505030.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613468fb1bb8f---28642422671.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/8921db5eda3b4a1d96af3515772272c4/nezokabeboluzakuzizoli.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/dafolurewofudogunedofu.pdfIn PDF document text
    • http://pk.mo/userfiles/file/25762221049.pdfIn PDF document text
    • http://xhzhengli.com/upload/motujegaxonirifevoponu.pdfIn PDF document text
    • https://atrax.hr/files/34953823577.pdfIn PDF document text
    • https://hinaweb.com/upload/file/53460205727.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/21547641020.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/ninadakufipudufutogedubeb.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386d685ee25---gabojaj.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/27549382013.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/16483332703.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/pafobinaguguzakexajufo.pdfIn PDF document text
    • https://angkalaris.com/contents/files/7250974479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=group+conversation+androidPDF 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_off0000e542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD59 10668 bytes
SHA-256: e3c152f3325a045c004c55134b5c81f16f55f6c4f3f96bf20694fd21c4bb56ae
font_02_sfnt_off000115f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F7 17116 bytes
SHA-256: aa1b35ab1700b272943452f76f38c415beb47e949c078c99ed42a2ea7c7c9eb8