Malicious PDF — malware analysis report

Static analysis result for SHA-256 818f096cf2c17e38…

MALICIOUS

PDF

90.8 KB Created: 2021-07-02 06:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 73a6e7f2ea29770ded6ca2b32f754052 SHA-1: 2bd1a49b31d88160f3190146c8c46b0f433e05f6 SHA-256: 818f096cf2c17e383d58f99155c7838d714f920011a8f2bbf95b2f4bfd13f5a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=brown+barred+goby PDF link annotation
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b71064ce3f0fecabb55a3e195c599b35/71313569757.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/5332382027.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/h8qjtq0vtapond56roaumfo906/30432524287.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/09742a8c5c3a25325eb764ca7b77b9c9/vifafibadakedozilovu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078403eebcb9---vurugijidigoxiwi.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/63fece2b400d87280a40012de83bf22c/37179032203.pdfIn PDF document text
    • http://dgjst.com/upfile/file/31639727202.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/zedawovuxesefowugib.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81212924881.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/nq1hokitk9e3v5vgt30uba6md0/28538271910.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/50313152786.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/29323089617.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/80149379469.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4efb1f1cd7---dilamedudepu.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/33828088139.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608356d6d0910---10386906793.pdfIn PDF document text
    • https://t2sc.me/userfiles/94347415902.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/bilifidunagulugazog.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/kibalojebose.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc492ec894---64987658088.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/gjme3p80273gvq5ojehp0h8u9m/bojetu.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/fanijaravav.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/19fa484fc7efd35d091de4a993858319/57442516807.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_off00010082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10082 10412 bytes
SHA-256: 7d5a18d66954480fb4be053e247368267d937907600d5045e4b6670ba74d9481
font_01_sfnt_off0001180f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13021 17792 bytes
SHA-256: f3694c2740c974196c198f64239db33c728c3150c7d544f3efa4178972be5f3e

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