Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ee1e7e085350f7…

MALICIOUS

PDF

74.3 KB Created: 2021-09-11 02:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1000cec4ad5ccf0b3b44b9995138c1a9 SHA-1: fa233efce1e00b40c87fe786a5f6d208d18e9d76 SHA-256: 39ee1e7e085350f7fd383b98c0581a3e77222e36a4b1e32c5cc8f65a1246b816
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=vineyard+church+windsor PDF link annotation
    • https://pushtypathshala.com/demo/aims/files/images/files/97696215156.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/torusovijudotiresu.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/86474149421.pdfIn PDF document text
    • http://quranday.org/userfiles/file/39249957899.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/watidavoda.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/fumizuxezaxefa.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/xavijiretoxisi.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/lavotej.pdfIn PDF document text
    • https://insp.biz/img/file/ketopifava.pdfIn PDF document text
    • https://purefeeling8.com/data/file/73945002639.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/tabilasakon.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/91096756548.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136488ce8908---tijepopawufu.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/kuwovebarewaburok.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161382fac78a3c---furof.pdfIn PDF document text
    • http://saktigroup.in/uploads/68119918733.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/rusitujenurepojite.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/bilewevigonusalovud.pdfIn PDF document text
    • http://guitarenko.fr/img/files/90405918134.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/99011993604.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/lawobobakawi.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9b44e15b3---pizijadoxujelirudoga.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/54279474457.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/xixow.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/majidafawadowiris.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/favipafolamaxu.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/rajojopaxofopu.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_off0000c044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC044 16520 bytes
SHA-256: d4c5b75bce8620b3f33dc2e94fe0202c71fd0728bb54e588fe276673b2181edd
font_01_sfnt_off0000eafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 10592 bytes
SHA-256: 4d409bd55fe94fbb059b3df48abfe5e34a28d323ae6e22721565d5b72957a4c1

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