Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe146f9bfebd929…

MALICIOUS

PDF

84.2 KB Created: 2021-06-20 01:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ff037d564b8f9185e9e2991ca2eb2354 SHA-1: 7bdd50b75d566cdcceef8e98c39b898157e3b2a0 SHA-256: cbe146f9bfebd92988493c773b6415ffc8e8bb53ddf9240a81f4ecc6ee669968
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a link farm and contains a lure to enable content. The embedded URLs and document structure suggest it is designed to trick users into downloading further malicious content, likely for phishing or malware distribution. No scripts were extracted, but the overall pattern points to a malicious document dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://krisoc.ru/uplcv?utm_term=exercices+sur+les+accents+cm1 PDF link annotation
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/jtnn3u302tv8ut19acer2flrh7/88242496377.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/dogerapemovave.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/227b31sipk8tvtludftjiika26/56118496350.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609732fe17ef6---posiwajozenakamujakowi.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/14107799579.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/makesulinugoze.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/motugirezesekak.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/vop562cogd89udo2q7tl2b11a8/98601459385.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b1a35d911---dokureso.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/l4d5kvccqpr876ahe5692phhup/zabevoro.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c9e3dfc6c---fuwudoburelakonulibak.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/38616754694.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/df3938324448d963cfae6da412f7cd2f/1895324500.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c57335eeb66---24441335075.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/zugarasilutusisumetumawit.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/79545918592.pdfIn PDF document text
    • https://mmszke.hu/files/file/torowezo.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/a47ictcau3lt3pgeoj4h4v2k95/pofurixiterilidunirepov.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 1644 bytes
SHA-256: fca02ce1bf143f4181150cc92dcb5615d7e08eb17e3b872de9b911ae88be45e3
font_01_sfnt_off0001011e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 5024 bytes
SHA-256: cd5bf9ade140fee303f31caf2591701a74774e9172eb832c4d9e3411c4c3ff36
font_02_sfnt_off0001121f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121F 1796 bytes
SHA-256: dfab3945eace5ba27be1ad95d63d5142397767eab6bca27773794b33bda2302c
font_03_sfnt_off00011aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA9 12880 bytes
SHA-256: b060e7520a3b2353ab864e408286f3b629a0d85c35a9b2286ee115c4cc202e0b

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