Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1f0804dbe4599a…

MALICIOUS

PDF

76.6 KB Created: 2021-09-16 10:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a621567624da323cf32c69e951e4b28 SHA-1: 485b70caf80d40f567d697639e8bbfbfd0dd3fa0 SHA-256: dc1f0804dbe4599a8382c6ee3379ea21f9009d8e4aae221d8e505663ba7e5940
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. It includes numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=watch+football+online+stream PDF link annotation
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/6c4446d5be9cd45a658626ce4e4f3422/70349075001.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/42093181824.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/mufikavivonarifaleke.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/musesilukavizodokukopetu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405bd106f62---13754466540.pdfIn PDF document text
    • https://austarpharma.com/upload/files/67155171558.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/xepatofereju.pdfIn PDF document text
    • http://fittbikese.hu/files/file/33693372491.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/rubos.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/kugabosekupis.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/98012696380.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/wotajuz.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/62521368325.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/8b53e2b01653784f24d451f2836d4242/mibasemopunaberi.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/21320207460.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/pitozejezatejumasazawo.pdfIn PDF document text
    • https://mbbs.hr/files/22501052762.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/dafibazelipitubonef.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/zinefunijupevamalirobonik.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16139102908655---45066681543.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_off0000c700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC700 17520 bytes
SHA-256: 59ce14714d065a9d8547519e7abea97294d509ef5343b3a24d4a1555c559c4c6
font_01_sfnt_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 10732 bytes
SHA-256: d80eb4445fc27c6279180a4da61d2e8de07be024daba751f53d4a632c4d79057
font_02_sfnt_off00010d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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