Malicious PDF — malware analysis report

Static analysis result for SHA-256 269e72f3169fbb15…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 21:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d6b2bcb8e3fb6d61799ccf0495b4bf4 SHA-1: 4af2479d04cb91aab0e7cd9ed813abb2158edbf7 SHA-256: 269e72f3169fbb15064cae40389f7f8b6c55e9ec342ad6128e7cfafe13679db2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to lure users to malicious content. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/umlur6pha37o0q2dj3dcmuqvkn/26907528264.pdf In PDF document text
    • http://geofer.eu/userfiles/files/fubamodowupewosijaroguweg.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/dawefizizoxivu.pdfIn PDF document text
    • http://aquatherm-graz.at/files/64639119381.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a638e13c6a5---kifadotofavanigalizuzagu.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/rozitikaj.pdfIn PDF document text
    • https://www.micron21.com/application/third_party/ckfinder/userfiles/files/rebusupar.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fc8fbee5e---72210231558.pdfIn PDF document text
    • https://kuepancong.com/contents//files/rodobetaxidetaxolo.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/vexenoxew.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9590ab64d6---13259052409.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/rnum59nkml6gtuap66p4lp9ruc/biguj.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a31bb18bd---vujejurefawomomevunok.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/80858518356.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/roxetutuga.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609052c9284d1---8833581101.pdfIn PDF document text
    • https://tepihtrava.rs//files/79843600601.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/56234066384.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210530_E932B3ADA67A675D.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/37662286667.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/soxitigilizilomapa.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/kedafikamewawamukisunag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=loan+receivable+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_off0000d703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD703 17980 bytes
SHA-256: 0253aa629c09c34f1804319656c71b6ea102414a21c97fbe54ab748266c16545
font_01_sfnt_off00010610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10610 10512 bytes
SHA-256: 372fb9182661ef5d0d6ff181d3c5645e649bafab9a320f85569e84e467085c01
font_02_sfnt_off00011dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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