Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce07d45152eb81a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 03:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e336cd0d96cee4d2c48b55af7e4028eb SHA-1: f992b059711731fd06c42f3e90eca8cfbd23c69a SHA-256: 4ce07d45152eb81aa8b4f6d87be57602be6be29acca8db58201bc1161abe6950
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://crysiq.ru/uplcv?utm_term=transfer+function+control+system+examples
    • http://dichvu12h.net/userfiles/file/xubukup.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/e4gf6jdf7lj44dpdf6bq38btg4/64624280187.pdf
    • http://ippon.lv/uploads/File/kubejawerisiko.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/18ad8ebf3cc0f5b1c9adc97a10c9d703/jebinakarorasusud.pdf
    • http://chocoenglish.com/_UploadFile/Images/file/pilijanaw.pdf
    • http://amsasecretariat.fr/userfiles/file/10833098414.pdf
    • http://mynigaoe.com/upload/file/20210902062634.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ca6bdb9c2---64887672108.pdf
    • https://mimpishio2.net/contents//files/dekafitulutepan.pdf
    • https://beldapin.com/calisma2/files/uploads/tujuzeniwidonixa.pdf
    • https://tolgyesvolgy.hu/userfiles/file/12581059278.pdf
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/bfj94vbo5hkrenn1gfflee826a/zanad.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c786e48df5---tuxigej.pdf
    • http://herve-coiffure.ci/files/wijawenazez.pdf
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210707_9EAC7DEA57DDAA79.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a8f891348a294dbd0b58f89e09e9b94a/federo.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/8489186539dab07f9e8d35e65f93cfa4/debupadagokimopoba.pdf
    • https://khanikango.in/file/zixizidina.pdf
    • http://stagnesreunion.com/clients/e/ed/ed16748122b3ff8ec97113314e0446c4/File/39080231121.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160923ef5076db---95147070098.pdf
    • https://sanipacific.com/attachment/file/39147438654.pdf
    • http://brette-animation.com/userfiles/file/fexurubovajajewimuwep.pdf
    • http://wohntraumgmbh.at/vumokepilomozasof.pdf
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34539372822.pdf
    • http://villa-carlshorst.de/sites/default/files/file/volajuzovazafonukat.pdf
    • http://beautybybelief.com/admin/images/file/varemax.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afb8359d15c---27870658816.pdf
    • http://teknis.it/userfiles/files/kebunesotidegalimojudubaz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d931.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD931 16792 bytes
font_01_sfnt_off0000f148.bin
34519d4a29a3d0f8076035dcf5d820d52636cd9257bc37492546be4fb27b74bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 10920 bytes
font_02_sfnt_off00010a9d.bin
f214e2027d699b5b9204dacf6dd795ada32ab68883ad115f8f9bd9c1888c92ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9D 17660 bytes