Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ddbaf137e33631…

MALICIOUS

PDF

79.7 KB Created: 2021-09-15 23:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a7ff6644d6946a3c8616ff58fbe1ec4d SHA-1: da6fb1c9941ae285b24c1b944095a71786e68b1c SHA-256: 15ddbaf137e33631893e82f19c0723974d7a3f70098efca3b1cab83856b0b922
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains associated with link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

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://garglob.ru/uplcv?utm_term=how+to+draw+cartoon PDF link annotation
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142050e0fd31---36254340240.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/retuwurosab.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/6248659325.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/62478449779.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/31490669077.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140e32e877b7---jutexupamabi.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210910203227.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/seduzupagajo.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021091304102073.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/11093580219.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/palurezelovaxutasoxupej.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/ximavimebeluniduranawejid.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/pomepuzonabez.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad2b18dfa8---gepuvokubid.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/95455206134.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/e6f1365bff5c06550b2577570ac11ebe/rafopowogenunalawa.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/jibufo.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/jelupeb.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/fidinemezasinewi.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/milujovilaxogul.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/71095893501.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_off0000d788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD788 16928 bytes
SHA-256: 6c5c61d9e04a94d7e6329b3d6d66a2d82e70a2c9e01dd8fef1a5e4da45de02b6
font_01_sfnt_off0001033c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033C 10000 bytes
SHA-256: c05adfe6ee6b0f8beb127713d92e0f4ce242dd17cf64b68cdc6cc0c55886d4e0
font_02_sfnt_off00011988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1