Malicious PDF — malware analysis report

Static analysis result for SHA-256 df63a3dce62f0983…

MALICIOUS

PDF

69.4 KB Created: 2021-10-01 12:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 84a2bb7c1d0fd0bb7e99d03409ad8a3c SHA-1: 921f14d5242d276be0572bde373f33ce2c3a96d6 SHA-256: df63a3dce62f09836b978af8eba296ea62362c7c49cd6822b1f72f36263ad26f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs, such as 'https://laborke.ru/uplcv?utm_term=torrent+client+for+android+tv', are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=torrent+client+for+android+tv PDF link annotation
    • https://pacantioquia.org/aym_image/files/78768198648.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161398ce25b385---62055477787.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210930225732.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/71765518882.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/bidazur.pdfIn PDF document text
    • http://umhouses.com/uploads/files/78261469686.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/ravuroxutadazazaxu.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/15611001090.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/sapumofilemogovarite.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/sunukikatolakafegateko.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef11dbd5a1---70072324808.pdfIn PDF document text
    • https://vietcuongcorp.com/uploads/news/files/dogevepado.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/memarikarobokuzezorivi.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/1fa9b904c50456131eb9345026278925/56676046914.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/5057139172.pdfIn PDF document text
    • https://successalpha.team/upload/files/sedefijosopawupakofevuf.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/xowigeferelopop.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///23074806245.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143088c49eb9---66719579749.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/rukimigowi.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/vivotutadufez.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/40991494951.pdfIn PDF document text
    • https://balticseaheritage.com/res/wysiwyg/file/doxupubavirifebinatu.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/piladofiveratesogikoxajew.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_off0000b1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FE 10328 bytes
SHA-256: ea164fe36b276d36088b434eea93bfd18f1f0ea434cbd574ac2cf4d5985e3176
font_01_sfnt_off0000c963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE175 15052 bytes
SHA-256: 0a36e1e871aa086d49594bc8dab23da52f4567736ce0be75db74f6d541da5640

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