Malicious PDF — malware analysis report

Static analysis result for SHA-256 439f4cec2458c38a…

MALICIOUS

PDF

77.3 KB Created: 2021-08-20 21:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 063c20a6f15d2eddd81ec33b2353bca7 SHA-1: 8497a968368c60a048dd291e1a3580dd490076cd SHA-256: 439f4cec2458c38a75b0177b36c1bac2013db70561d64a8077e407e5ba671744
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure, but the overall structure and URL analysis strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=how+to+install+genie+garage+door+keypad PDF link annotation
    • http://ajivikafinance.com/userfiles/file/fibilunozujezuxutonitew.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/xurexemukujivafebafojasi.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc72a1bf42---24177792582.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe1f87f276a---7018414881.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/zalivipudazi.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f8a146ff6444ef9ba3abf9e034aff8f9/kafevigedapiduserolefebej.pdfIn PDF document text
    • https://pecsikult.hu/files/file/47149721693.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0pk0u0n1rg7gd5b6trq1qri3u7/3110617835.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/46816738136.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/minotokijukabuto.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901b97338b0---vosegakupe.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca0aacc8c---3115222284.pdfIn PDF document text
    • http://franciscakeryandcatering.com/clients/61981/File/42723515742.pdfIn PDF document text
    • https://paperland.bg/uploads/file/90935291562.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/xegisur.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/tikorerumubibizometebogi.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/86512997018.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608826a1108f0---jenefumovaradezufulosa.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8fd4abe88c---90428194817.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/68896036729.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/7931643912.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/c464ac3734dafb958e99f2145c685b98/samojikobofu.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/vajilikugeles.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106241238221594.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/voboxagafojog.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_off0000caed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAED 10852 bytes
SHA-256: 942ccd29308174c014f880b408cde69c959cabe5efbb17a3540243247bd36ec5
font_01_sfnt_off0000e3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC03 16056 bytes
SHA-256: d38da636d1b190bd7515d388b18d51c798a071b259bfbc4801ca28ffe4b5da36