Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe43d132c86b0e0b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-03 20:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4260d165b42ec9bbea96cf9786e22059 SHA-1: 814bec90e1ae6e8038c7499052d6b51627f5a739 SHA-256: fe43d132c86b0e0bed8083829786057de6ee0dabd1c5cc2e8d5c06f53f13ed2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm for SEO manipulation or to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://altelaw.com/uploads/image/file/matexutawuwe.pdf In PDF document text
    • https://soudurelausiere.ca/upload/editor/file/50021744526.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/xidejomalabalivel.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4fa9f5cc499797228517f2f0ee771d30/lafefesukoxalubobi.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210829173528.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210621170311.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/5700356309.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/38601878445.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16079a0e65b4d2---75676053333.pdfIn PDF document text
    • https://rintrans.com/files/xovalibun.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb3dee4002---tanexaxoduwinazage.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/18565358155.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608772db4613b---65678530214.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/nivikevamodowobev.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adec8e7d7ca---kufematapimivofew.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/8bec88b94babebffcee9951c56c64128/xagamamefixanuzunenonogul.pdfIn PDF document text
    • http://aimic.com/userfiles/file/75326248910.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/95756214999.pdfIn PDF document text
    • http://heureka-cz.eu/files/gutimatulibof.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c674c9cbabb---wowotawevadi.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/97928436245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=mazda+demio+2015+manualPDF 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_off0000db91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB91 10624 bytes
SHA-256: 0cd05873f9cbb683f750e5235b146e8097c1c10c2b1a96ba3b09d6ca9ac3c9be
font_01_sfnt_off0000f3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 19784 bytes
SHA-256: 23af3b51c3afcccbfba09852aa5da5adba211baee30d8094a7d03287fa7c6069
font_02_sfnt_off00012765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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