Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b5d685067b4f6f…

MALICIOUS

PDF

100.2 KB Created: 2021-08-02 18:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 110e4d5dcb29945b40091692d35f1b44 SHA-1: f5bf8053b7443efaba48d85b9f51d1d8625abafe SHA-256: f1b5d685067b4f6f81bf185204ba0692dd4e0f5d6bbbcfe14d0bb67afa1f2a93
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://www.lucaslobker.com/minor/ckfinder/userfiles/files/60304504115.pdf In PDF document text
    • http://domeinbeverdonk.be/assets/files/file/tanirizidobinaz.pdfIn PDF document text
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/xavoloxinuzipada.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/6061157809305b06c60dfa50e2dd18fc/novefewonisesep.pdfIn PDF document text
    • http://fittbikese.hu/files/file/gonuvagizotujaga.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072fbce7787a---57572565598.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/tonapudutevelazi.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/73158450855.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/kizedanu.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/2087617531.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/jusozanorimu.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/gubesaziperamufolip.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/lajuduvoguwojeboradizu.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e4cc5f43c---vizaxapikulewelanenuxeg.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/0d8f584df0441f7372733cd77bfd150c/55953923736.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/gikatumem.pdfIn PDF document text
    • http://harperfamilyreunion.net/clients/3/35/3566a42c83b0accea4ba2bdfee5c7976/File/43381221366.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/16910253200.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98260236cd---19282367568.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/tivumorenat.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/13j2ati7053dncd9ggej0jndul/jejim.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/sujanowagabosasakama.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ep1gj9nb47i0fq8jitc7lsd9kd/91028818013.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/nijabele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=red+dead+redemption+2+mission+list+onlinePDF 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_off000123df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DF 17360 bytes
SHA-256: 0947813bddfd5d8f066327757a81681dab2e0e591972cb941872bf7609b3c4a3
font_01_sfnt_off00015128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001693f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1693F 10720 bytes
SHA-256: 5726911cd977d57c57b1f91ca369900ccefabd345da3913495ff73d1bdfe38b6

Open this report in the interactive analyzer, or submit your own file for analysis.