Malicious PDF — malware analysis report

Static analysis result for SHA-256 c199e104d9b71d94…

MALICIOUS

PDF

97.1 KB Created: 2021-09-12 08:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9a016199a552a5e0cba55233d2d048f9 SHA-1: f454adff4273643eaab0c6beca500029378e5b31 SHA-256: c199e104d9b71d94aba076061188c4f9e69985de751380b654fbcc7fd27da003
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the document functions as a link farm, directing users to various external websites, some hosted on compromised CMS platforms and others on disposable domains. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://studiosiriosrl.it/userfiles/files/39177957883.pdf In PDF document text
    • https://warungmimpishio2.com/contents/files/74035228283.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/56821307764.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/zupazanab.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/dapavowodome.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/kejebugonorigojuzitolaj.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e9ef5d842---potorikifan.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/solabejuzawokosamifav.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/kifaleruxinojekelonazi.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/titosixetenemodukidimavi.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/rosogox.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/21912037416.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/walobidisakido.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/21428440362.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/82872436822.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/26865775881.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/11263435579.pdfPDF link annotation
    • http://esenkardeslerinsaat.com/resimlerfiles/sobodesunefeku.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161364ec7f3983---mapiwobijuligizita.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/zavibupibisat.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3a0707949---vizozolozumij.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/duvelesavumalel.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/jaxanugipig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=bloons+tower+defense+5+pcPDF link annotation
    • 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_off00011b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13349 10632 bytes
SHA-256: cb1de9f266b662c49c936b9dfe2f0852f435fd979f4e67247290b4d539226381
font_02_sfnt_off00014be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE4 19188 bytes
SHA-256: af05627122459361bd72aeefc55cb8c4997b52d5d9356c5b967516d66ac2b8b4