Malicious PDF — malware analysis report

Static analysis result for SHA-256 2caf9d59c15eb7b0…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 05:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4669e499e83230242315f0a439120803 SHA-1: d5f2c2246d359c02dc6eb9afbb5d0ce08f2f220d SHA-256: 2caf9d59c15eb7b0c880876bc54f809e62fe713fddac11e01cf75de1325b3535
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://j26clean.com/upload/files/paxegutefusoz.pdf In PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/72993514499.pdfIn PDF document text
    • http://nenorm.com/files/files/minofabizi.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/0f9703742c86c4a72a3ec86051679c36/wimujowefinonatifos.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/3c0958b3b3f5530a00d015e37959bf78/fazob.pdfIn PDF document text
    • https://anfauglir.com/images/file/12631024563.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099ec0b3b9c3---79112338395.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/94557573227.pdfIn PDF document text
    • https://le27.fr/docs/file/wuromojegitiluteroze.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16091c5051512f---pusazovivibozozetivamun.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/guvezupukozepagik.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/24345010918.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/nolamonemafipiwuribi.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/28962937771.pdfIn PDF document text
    • http://myredm.ru/uploads/file/pejumolilevadasebof.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/18304521787.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/mipewazixunakigosufusu.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/boloxugenusup.pdfIn PDF document text
    • https://intersat.lv/files/file/fikowebobefuxajes.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/widutunururifebarojanugo.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///2981121643.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/guwujiforeput.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c207d716b18---50091755400.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/zavesunezigexivixivesi.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/piwijirorelas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=reader%27s+digest+april+2017+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_off0000df08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 10872 bytes
SHA-256: 9ae26704ee5cadec2b714c07dc46a63ca7da5326ec5df5a35bf17c7e31e4a91d
font_01_sfnt_off0000f833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF833 17684 bytes
SHA-256: d08726d9c9a7eadf44afbf44dd17d03e0f557357b22a6aa8db14c93b51ab8906
font_02_sfnt_off0001260b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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