Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ae1bc8cf483790f…

MALICIOUS

PDF

84.2 KB Created: 2021-09-07 11:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ffd8d23617c4922a4f0fddf22d226ead SHA-1: d7f6ff7d2c3b751854157650128e819097869bb2 SHA-256: 2ae1bc8cf483790f220c55a0220d752f745142bdfda1d496c2e181ed77639527
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that act as a link farm, directing users to potentially malicious websites. Several heuristics indicate the use of compromised CMS uploads and disposable hosting for these links, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 https://synerhu.ru/uplcv?utm_term=mini+maquina+de+costura+tecidos+portatil+manual+de+mao PDF link annotation
    • https://muacash.com/webroot/img/files/porejebamubewifog.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/14836570980.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/vumogejunisuwosajukesawo.pdfIn PDF document text
    • http://allasclub.com/campannas/file/40588375070.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/58819837015.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/disiwenufezodusepiwido.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a3416dacf---42964603025.pdfIn PDF document text
    • https://melz-feu.ru/upload/17812097601.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/mabun.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096610b16f98---xaluratafudenanototuzalel.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766e4eda72b---woxipofidu.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a7badf887eadcf57deae9f403eac066a/dirapidaviwemesefimugisa.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/11581946282.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4da421de951fb6abb41492a192332d45/7031535253.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/1edd51311a281150f109515d3a679b99/parixatikepevov.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/89026720908.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/pimaf.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075713dbcd39---nomegenatetufo.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/7nlamne8t8s1oah5t0s82qlkgu/6336641465.pdfIn PDF document text
    • http://home-plast.ru/foto/files/ludokamezen.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb11c978977---jejegokizeloravuf.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/gexexojobobusega.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/viwimuxupejupimonenimife.pdfIn PDF document text
    • https://hgb.se/filer/file/71838292911.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/134b7986f5d1d8fb5b48506da469b11d/91910136793.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_off0000dbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDD 20748 bytes
SHA-256: 7ea92084393adecb2811683a0bbdc44ebe61746c63a9defcffa45e3c2fc7f0e0
font_01_sfnt_off0001101e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12835 10916 bytes
SHA-256: 0fa5e3cc7cd4d51ffe37fb43ad0ff62dafe081801974215b0fed1e94570ef549