Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb3f7c7aa41dcde…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 11:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a15c400025eaea1223bd5f1b01284e90 SHA-1: 8b571bed975c01a93c96c860f38c95a4bf9dc80d SHA-256: 3eb3f7c7aa41dcdee8e7d1616e819dabd832675c31381c1c98959cfe6adfb9a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate an attempt to direct users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=super+mario+64+soundtrack+download PDF link annotation
    • http://dagmar-e.de/userfiles/file/53696182769.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/kikopemasalu.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/fudevekomarimobo.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/tofabejusejoboxabuv.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137346f5a1b6---61002343868.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8e6c93f50---98191334944.pdfIn PDF document text
    • http://kientam.info/uploads/userfiles/file/39554084489.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/63342799425.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/3893e49152cb3c627b068c2394120dfa.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/refusepujodowow.pdfIn PDF document text
    • http://strandedtattoo.net/file/davuseril.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/12671285669.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/63367024666.pdfIn PDF document text
    • https://lorus.rs/files/mexosabigexe.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613309277e350---68221355611.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/26129523457.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/xonuzigebebonume.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/kuvezomitekevopewogo.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/79774314663.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/47821356185.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/14893524937.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/8157956383.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/jigofunokesubunonaz.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_off0000afd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD2 11272 bytes
SHA-256: 9a22c4600c8b2deac5e23afa92dc6cc866a5bf0a2786b4e65beb7c07d2f61069
font_01_sfnt_off0000ca5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26C 17332 bytes
SHA-256: aaec20cdd3805950a1d7c6f948a72488d3483ba1b1e7346dfd1b64a5e20c0c4a