Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d0d2937f74087f…

MALICIOUS

PDF

87.2 KB Created: 2021-07-07 07:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6c6c8e476d156b6560ad40d5477070f7 SHA-1: 65ea9b273718edf78b24bfe86b25e73fd3d104ed SHA-256: 74d0d2937f74087f2414d1cb29eb1c8e61f59f378c0a986cc586cdda9084037d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be distributing malicious content or engaging in SEO manipulation through these links.

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://ka-base.no/images_students/files/sajudenumifanodinuta.pdf In PDF document text
    • http://darienhigh69.com/clients/866565/File/16736893911.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/tizikexezoninopag.pdfIn PDF document text
    • https://limmaginebistrot.com/file/34061640718.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb0362d9ed---33056413053.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/74510983278.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/28923270581.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160986af710758---zonijidavugaxo.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/855ff30a35efacb849f66b3b39e7edf6/13607615204.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982dda36224---xulevamegotikipode.pdfIn PDF document text
    • http://tfforming.ru/d/files/56510033098.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/sibinewoxaj.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/pobejujuxatifu.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/epucfkijp88qupmvdotdplnheo/verufigutatusaxuzojadom.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/doligoxavibexoma.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/3r0tdia9o1a1bl4dm8elfhvnee/zazafujarak.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/40520304528.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/58962481614.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/momotabafu.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/66674658145.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607830f7de7d7---lirodenobukilume.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/4938723c3ff0cbf8e4195b3160ae7240/rirexosi.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/dolefarifu.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/b13c00cd824ff1327b5a3fae15a467d1/50058120825.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/57592004032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+get+slime+in+minecraft+survivalPDF 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_off0000f07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10895 10920 bytes
SHA-256: 243667c98a1a383bcf5f4a25610410e5fd9ef222730305cea01ac2b2ff893a5c
font_02_sfnt_off000121e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E8 17488 bytes
SHA-256: 5214c038e4eaa86134847a4b7d429937c7d415f117a8496940f15f42d7861454