Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a6f251c1a8d265…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 17:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f1f054985cffafede415c1306e57b465 SHA-1: 7966d3baf011242971747b9f4c497cf4b0246418 SHA-256: 15a6f251c1a8d265e5f0aba06dc85a8cdd1ef01cf38d84c17f5c9c50d26251b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kodcomputers.ro/2664/uploads/68554837663.pdf In PDF document text
    • https://interference.ajoda.eu/userfiles/files/gerononidiwobowujebep.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/gibimije.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/bezavivividalewetegivapa.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/5l6meeeus86h51io67ms8j0i8f/bivonetidaf.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/72742164463.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f27c0339c5---zubezinavuxopo.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/41012819868.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/guguvuzi.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/dimugebaw.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/29354308117.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/80412941698.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/45010963889.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///98477932967.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614336e91c0e0---17114763388.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/bugebibugoxijawisozanuzex.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/kivolelonibojorugibam.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/24632467953.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143915a7e9cd---goxagulalerogeduz.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/duzir.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/31118163867.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/28016432728.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109161630585391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sdk+build+tools+versionPDF 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_off0000d6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BC 17376 bytes
SHA-256: fcd5804dd1effe083b1da90d4d7061172779da0c9b5b8419cb55aba1131bb15c
font_01_sfnt_off0001039e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039E 10552 bytes
SHA-256: fb9dd944458e20b9901a3cacefc14b753eed237844c47bbca08900a875546be4
font_02_sfnt_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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