Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f423ee52d6181a…

MALICIOUS

PDF

77.1 KB Created: 2021-09-05 02:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bfe91f0961c3cac862704aad2d376d58 SHA-1: b0e85b136f0058a7b6eeaaf32b4913231bc4da09 SHA-256: 53f423ee52d6181abd07decfeccd4072c4c8eb66d52815abd1dc491504c908bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.netcorp.hu/data/editorfile/11723563796.pdf In PDF document text
    • https://calmoinc.com/upload/editor/file/13421237580.pdfIn PDF document text
    • http://generaldistco.com/images/file/6176563398.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/59032345078.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c716c07570d---lobajulelo.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6edfa3aed---dewunoz.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/36015697756.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/jixuxazop.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210812090152_MzU1OTA4MzA4NDQ=.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/3967662304.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/boloxugenusup.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63903210486.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/teluzenebadusofopol.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/mopovanoreki.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/77317613272.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/ebaf1a6d5006ff2f666a00e1bfb5b155/73169486722.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/situjorixekuzizutorina.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/46651935664.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/nokur.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/47495972563.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/lv65flhm3074ddr28mjnffejp2/novejelakepemaj.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/tuwebenutipafixorolosam.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/31550230652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=types+of+contrast+media+pdfPDF 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_off0000cb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB03 16672 bytes
SHA-256: baf31f62e8fa781f3e2558ac045f67886d6ac0fd3e9eca15b4c623a8571b3074
font_01_sfnt_off0000f5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E06 10812 bytes
SHA-256: f62aeb737c7c5f45addb80c19ce4cc4c8dc3155f95810198d03f2cc385d55c64

Open this report in the interactive analyzer, or submit your own file for analysis.