Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3c3213207b5057…

MALICIOUS

PDF

73.6 KB Created: 2021-09-13 23:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d3f3f6fd66e54d8534b03aec305013c9 SHA-1: c92c72559bbebb2b987c5a52491a20245bded597 SHA-256: 6d3c3213207b5057bd1d3b1cba43645956fb8213b8eaaa577d211fd33d849cc1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users. The presence of external URIs and link farm heuristics strongly suggests an attempt to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://indagosrl.it/userfiles/files/56847250594.pdf In PDF document text
    • http://www.tomasjelinek.com/img/pub/file/vafikapijefewutisijijun.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9e00e2feadeab548c8887278c6f8f88d/dabifebe.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353315a935c---waretupivebegoki.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/tipijuboma.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/88499839711.pdfIn PDF document text
    • https://marosme.ro/hirek/file/xusutupibasanovate.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/12374960411.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/80146737477.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/pozaropuxukojokapop.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/61793847953.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/11994378917.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/jifutifotiwukuzogul.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/75867654499.pdfIn PDF document text
    • http://iltorg.ru/upload/file/43759186942.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/34893790933.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/kon24a84o6rrnlftltnggadp9g/jagozifur.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/diwulifubamugujoxuzubex.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109121520255844.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/21506096478.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/72424355158.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/89267178454.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/6119954061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+lost+city+of+z+putlockerPDF 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_off0000bde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE9 16200 bytes
SHA-256: 3cb97315ea559b61bba5c21251543a892ed9607ae93864a979f0ffc76b871d2b
font_01_sfnt_off0000e7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E2 10640 bytes
SHA-256: 6e53863279ca298af400c532b6b94d94bc6abfb4c12c4ec938ef149b6023ca92
font_02_sfnt_off00010083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1