Malicious PDF — malware analysis report

Static analysis result for SHA-256 2de22f4e8dd5966d…

MALICIOUS

PDF

86.4 KB Created: 2021-09-24 05:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: edcaf875d7cd27d873d98df871e6ee29 SHA-1: 72ec0a36306ea1dc1c615a87b9d9a7a2b7282c97 SHA-256: 2de22f4e8dd5966d0f5f3147138f39d7e1072753af95384a9971278d72d50e31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with heuristics indicating a link farm structure and the use of compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://manuscripthandler.com/userfiles/file/xusorudowugujunit.pdf In PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/753ed1127ec6344772df770c046fe7bb/96123533224.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/nebewamedapixuguranejef.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/jikulifaravitut.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/vafafik.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/zolifof.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/vafokus.pdfIn PDF document text
    • https://nyig.com/files/file/70208186213.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/50337104366.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/resefisi.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/furezadarateso.pdfIn PDF document text
    • http://haki.vn/uploads/files/91525849707.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210911_386C6E11D01E8146.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/fodubobaxesev.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16146caac13c26---28767102260.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/10717516013.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/28791987802.pdfIn PDF document text
    • http://www.centralperdana.com/file/17895581755.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/zadeburafujapevuso.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f1ed1c1c2---95530614435.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/gadozuzegafime.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/84320305583.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/39862838373.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/rowejibegedabugumofiv.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/kezufivomowuxudomiwubov.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/85572844633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=android+pencil+appPDF 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_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 17216 bytes
SHA-256: 229a18efb25d019349bab30b2f9ce17aca1fd3124de32c9bec956563e71d6936
font_01_sfnt_off00011ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE0 10220 bytes
SHA-256: c0da52a791239dfbb1a503f2510a5d4af7d2175eaae228d2d29d6c14429478dc
font_02_sfnt_off000133d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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