Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f6b50b47063bb5…

MALICIOUS

PDF

75.0 KB Created: 2021-09-14 19:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0ef70af07f324c675e19dc9e3564020c SHA-1: ad7d5f45591fbb35cd58c19d8215f617fad4bff0 SHA-256: 62f6b50b47063bb53b4ff4b5a5b32fad5cea64ad9bf99acafd0d40986d463436
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point 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 related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://plechotice.sk/tmp/file/pakus.pdf In PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/zozav.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/80814224748.pdfIn PDF document text
    • http://mobilenmr.com/files/files/mixugovepinero.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/58065781234.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/pokixevobidoxifamuk.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/ripulekorowajavokubuma.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/9467731421.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/kawufapemokezuxoz.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354676f092c---kezevutikamumedon.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/60374809470.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/wamokulomaxukenesesaxiwo.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/sabibonafonebuwojilibumed.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/94459661905.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/60224906043.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/43854523448.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b9c53785---46808321702.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/bixunev.pdfIn PDF document text
    • https://medtek.vn/storage/file/92198660855.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/5342249245.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/42988053180.pdfIn PDF document text
    • http://humanlitech.com/files/files/88537765543.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/sobuxaxamosanin.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/mikusinutogavix.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dd5179848---80830882399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=extreme+car+driving+simulator+modsPDF link annotation
    • 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_off0000c38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38B 16396 bytes
SHA-256: 91b1ee045bb798315a287556283d9287b6299186d28707ceaf367a6e8dbd1b45
font_01_sfnt_off0000ed51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 10964 bytes
SHA-256: 1aa64c76e85b7874d19cd5f5165a94ce8c95ec957be34d739bd4284a6c667e8e
font_02_sfnt_off00010699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1