Malicious PDF — malware analysis report

Static analysis result for SHA-256 7497f827316d2e9f…

MALICIOUS

PDF

78.5 KB Created: 2021-09-15 20:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 053d25f0aa139d62c46b7c32313e881d SHA-1: d01907a8fca71fbab330fce50569e2c9ccfc7638 SHA-256: 7497f827316d2e9ffe6f25113e63d7bfb769cbabb95261e60ce045f9e72f8c82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://smidgel.ru/uplcv?utm_term=what+to+do+in+the+nether+in+minecraft PDF link annotation
    • http://ekhoron21.mn/uploads/files/76941266752.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/54304920318.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/57773622335.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/16322450455.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec708c5639---belig.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/rirogazurow.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/rojomovatikowo.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/jjpo0s5ba118a18jt08ddc0687/42770288888.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/fosogajufiko.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/buwubamomuzarakolesibinu.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/24308957925.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109160046396723.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/lefemufakejege.pdfIn PDF document text
    • http://feg.vn/uploads/files/feripefuxupoxeza.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/xesototew.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/bifiv.pdfIn PDF document text
    • http://samtle.net/ckupload/files/lulamafafilimanafefolev.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/15087875335.pdfIn PDF document text
    • http://ud2-140.com/files/vabepixebifutonazamaxod.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/jvhuckusvh6rsechjjdf9lc9hv/48806779023.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/19091523712.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/32346118074.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/46217427346.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/sajisugenubapotirapenov.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/jalifumuzebumiwove.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/53847603303.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/numokiduxuw.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_off0000d169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD169 16724 bytes
SHA-256: 843efb9fef4632499b627c1de97c0d38c2bc6ff259dddda079fb127d202a4e28
font_01_sfnt_off0000fc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC09 10520 bytes
SHA-256: 45584402643329e200532ac4b7e3221abfb14e714b33822634e7409cb98f0fec
font_02_sfnt_off000113cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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