Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38a1a9edd6769e1…

MALICIOUS

PDF

79.5 KB Created: 2021-09-10 06:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd6d6c08ecb35902c7da4715fd0279dc SHA-1: 6a4ff520017fcae3cc09517bba7c98acb74c1986 SHA-256: f38a1a9edd6769e1e81ee7bcd7d5712591707f6b8a3465bed56883beba897cc9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Several extracted URLs point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous links, including those with UTM parameters, reinforces the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://a899.net/userfiles/file/jemegoboranevevofofogij.pdf In PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/66738757251.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/28537454405.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/ditutesupenutewabizidu.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161389825a2252---22988931342.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/24344992189.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/57822259223.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/menaji.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/wasidavazujanolulozuse.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/056ba1f0cb81f6d7f90892cdbfeeebe0/mesijikukewefaride.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/36551431097.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/85236890113.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/17861242505.pdfIn PDF document text
    • http://pneusmarene.it/images/file/zexobuputi.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/33557088374.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/42932716880.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16130d0b2929fb---14284161828.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/rilezoneb.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/sokefakejenugipo.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/95860810679.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/xifawibufedolupevil.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/25119290434.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/kuzanonoxepimegomi.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161309586613a7---41774461843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sherlock+holmes+stories+in+malayalam+read+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_off0000d04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04D 10916 bytes
SHA-256: f15a9c43bd649e6f85aedc278272d21dfe811bbb72335d4bb21f0e21776e3132
font_01_sfnt_off0000e96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10180 18252 bytes
SHA-256: d2d3cdb7a0a4b180d4598bc09abcb98e1241d971b047c0480fc3d9e89f1caad0