Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e352721c08d2cf…

MALICIOUS

PDF

86.9 KB Created: 2021-08-23 12:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3c44ce2aeea3bf743cd5b87b6bc7a7a1 SHA-1: 4027e851551e0aef2044896ccd3c31ba3165ca72 SHA-256: 20e352721c08d2cfd211d9fc87c4e36c26dda68920d05abe1a8cecfd2cdd67e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://allytemp.ru/uplcv?utm_term=insta+private+account+post+viewer+apk PDF link annotation
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070daa428edb---89317878235.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/xuvogewox.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/juzesitejiverolufug.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160906c92533c2---81820916839.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8f9de07cc7575d20ecdccc6c5013b924/jepamop.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/fofomaborerasetavexu.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/25521330136.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bdae7af10b4---kumugugixabolom.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077cb200a4ef---sodorokopetulenokukoremi.pdfIn PDF document text
    • http://nineslash.com/user_file/file/gepiwobepokuga.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/welunop.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/59041103766.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/59274239824.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/favaxofir.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/fae69b60ae53854294b728c6208264b0/zizidesurilu.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/sbgknr7ifngjcsb6feeuemc6dr/86141096638.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/nadipotudiwonemenuzikijol.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/54381104227.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/f4b36e31ec9d1ae09d48d6cb05e51ad7/tazokedivufavivozep.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/fa39a3f10109650368d37a4d7051965a/fowugo.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/78054159528.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d3d2e195b007c90b3cd15f978ec32496/losapix.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_off0000ed84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001059b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059B 10616 bytes
SHA-256: cb4594da7ec391af82024b3ac361abea9aac17645593de66b6ac02b2ec6dcf0c
font_02_sfnt_off00011e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1B 19028 bytes
SHA-256: cb6a353c3ba8705bf4a6db719d2d0fec67d570b00d477aa793a08081902f3d18

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