Malicious PDF — malware analysis report

Static analysis result for SHA-256 6537b7d007ba0732…

MALICIOUS

PDF

85.5 KB Created: 2021-06-28 05:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03f2a32d8e67c2d510f39d98a9272bc4 SHA-1: 2ea05c6195293adce4d18a40887e11b36b510754 SHA-256: 6537b7d007ba0732028a39bfccfea96a92db2611b26795c5de1fb9f0bd4f6e6f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations and point to PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the nature of the links suggest an attempt to redirect the user to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/6ae1mnsbkeqcldm3tnd4kr5m6t/mowokakupuwofurabobabuduf.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/964atjqfg5bd1q51su4ramguf5/vamid.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/a7967e473ede1ac6bdf0da7b6d3e8c56/55231701362.pdf
    • http://fdscience.com/UPFILE/userfiles/files/zupezelexozizusax.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c74fe03fc93---43783889382.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608de81e6c235---deseranadokav.pdf
    • http://cuacuontoanthang.com/media/file/33202320385.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8c1ccd3ab---64882786089.pdf
    • http://tubietelbar.hu/uploadfile/32210101385.pdf
    • https://autoroman-service.ro/imagini_ws/73783467584.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd7065c78c---ropukufasoxuzajuk.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070868934057---74611844769.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/b215bef72d4aac338ea029f4ebbb9e05/pijugolu.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/0338f662ebf3bffa709661abc69015aa/55462528746.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073610f238b7---7214341094.pdf
    • http://www.darvidproperty.com/news/file/ropaludukokepufepal.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87fa01ed0a---8551403358.pdf
    • http://www.sealjet.mn/pictures/files/26425350405.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ccbf85e04---14367988274.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160710bb95fc76---75576891510.pdf
    • https://spacio.hk/attachment/file/kafawutugi.pdf
    • http://munsusa.org/userfiles/file/20210523202744.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871a346e0db---97445248248.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=life+in+the+united+kingdom+a+guide+for+new+residents+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea38.bin
5ab6d0f45d303fe00415d97bae516a4b01c312a65b37064d7943f378506050e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA38 17032 bytes
font_01_sfnt_off0001164b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1164B 16792 bytes
font_02_sfnt_off00012e62.bin
bdd30902b4ba3f26cdbff1f1a682d3cb6bf8e3c44f3631f6fa8ed302a7546042
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E62 11180 bytes