Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c0dfcb777461ca…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 19:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bfdcaa8e732e333d63b7f1d1594201e7 SHA-1: a2b901edfe832037929605b9fa41f8ebf972d0fb SHA-256: f0c0dfcb777461ca53ba763b898bcd37dc885bdd243bcf517c0ecd897a6efb04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://krisoc.ru/uplcv?utm_term=game+of+thrones+season+one+free PDF link annotation
    • https://billionbosses.com/ckfinder/userfiles/files/ditumozojabitenagurobosug.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/1705254363.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/67310204317.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c86aca5cf3ddeb2dc310d393226893e5/48713523932.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/jogemeguxe.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/36562933521.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/fupozureb.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/1365319614.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/55093656772.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/55265107050.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137061ad8cc9---wisebenirubiridaxi.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/44940098189.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/lobepogoxof.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/xugarunobemu.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/mafob.pdfIn PDF document text
    • http://cabini.it/userfiles/files/50943205367.pdfIn PDF document text
    • https://braus.uz/images/shared/file/sabuna.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/2cd76e8044ed40a5684bb374249d6c40/fowat.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/41921376649.pdfIn PDF document text
    • http://rrarental.org/upload/file/ximojebututexaleparuwajaj.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duvawakoxovuse.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/julafoniridel.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/74548866979.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_off0000d743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD743 17236 bytes
SHA-256: f8bb7d9a1a0a35890543d00118ce5b563d28438a541fee2ee70255565168328a
font_01_sfnt_off00010379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B90 10380 bytes
SHA-256: bafcd4f223ec7de723b402fe39c70345aa38b104c5365368887d7881cb001483