Malicious PDF — malware analysis report

Static analysis result for SHA-256 5935c14fe0a04688…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 12:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f64e96ac61e13d3d204a0dfab238d3c SHA-1: 0740d43e411175224147f601f3edc8f51b2178f4 SHA-256: 5935c14fe0a046889042e5050d1729eed83d828c7144a0c78f6f188c10e50bd6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://smidgel.ru/uplcv?utm_term=packaging+of+alcoholic+beverages+pdf PDF link annotation
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/691f68f874f36ebc7988de5973806b73/wopugirodosexiremev.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/93467184248.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/jenipomut.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/79eeacf2e770af3e5197f90d7066b1e5/xuzozoluvejalipekepugoga.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a77f4af7e---sozun.pdfIn PDF document text
    • http://tochuchoinghi.org/files/lepurisomesutifap.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/d2dtnkbu6f60o447k3o0lfie2e/47826852304.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613018e8a3ee9---zerevijenixejusujuwi.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/59766876706.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16123b000102bd---zolutuvugalexenekeruboxuj.pdfIn PDF document text
    • http://nakatka.com/files/file/61002111562.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/19653c943babfeea9f4a81fbcfb8594b/88298560944.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160930e0eda7a3---73229577580.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/5146368596.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/50113583520.pdfIn PDF document text
    • http://bahsclassof1965.com/clients/1/1d/1db829f64c2e26d3b32b12ccabba4d7c/File/14819797932.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/7191450182.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a6a36f275---59342287681.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160872bb4e35aa---lewewade.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/gorefoliruve.pdfIn PDF document text
    • http://www.siposferenc.hu/html/zuralowo.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/edc4b92ac19a44a62ba76c06975253b7/jonoz.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/32459698837.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/99370829154.pdfIn PDF document text
    • http://msiutilities.biz/documents/livajosixarevejeni.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/31161614586.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_off0000d862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD862 18168 bytes
SHA-256: 15bde0694224699ed10bf38275c101b9a5427bd1e6a5656742f4191778eb194b
font_01_sfnt_off000107fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FB 11100 bytes
SHA-256: 5f7a0921f933c7fd7f6c7547b75865eb8cd4c0928da4e9fb8f8eab7c55792e4b
font_02_sfnt_off00012165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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