Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd3e2ae87fc2afd…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 21:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 606bd45e7c51df936063fcab309a00f6 SHA-1: 43f138d9310ce875bf193081d35b88c7fe20239f SHA-256: 4cd3e2ae87fc2afd4482693bc50dc48dcfcffb035170677b1c481c4aac5e4f39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://laborke.ru/uplcv?utm_term=differential+diagnosis+pocket+pdf+free+download PDF link annotation
    • http://amdind.com/userfiles/file/34442005946.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/cc2497497bce07317551b9867c0c200b/rotilamula.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/47594231949.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d8ceccba90---bomuzumulonunadila.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/9c98f5db734bc0e489f68753d89995fd/pitoravunotajonamune.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/vuximorifanabokogemutol.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/47583258508.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/45470926786.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1612cc96c3d7d0---73663883872.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/61609011669.pdfIn PDF document text
    • http://tonystelly.com/clients/873487/File/kagolexami.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/96381663119.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/6be75ceda3abedd3874821bd5655d896/surakit.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/83756647036.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/33602335447.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/8d63380c6784f18395a5ce7156046764/73317096618.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16121c1349e216---48795327223.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/0ebba1dde27a7836d45d416fd9228bc6/wuvalokepuvobi.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/90277571698.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/64114086880.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/31503068955.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/duvorasazekusekilowovu.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/4346307631.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b52e0fd8003a2058b8f363116ea8c1ef/sexuxabixogobum.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/joramererefezavafeteve.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/41414123766.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b843d9be5c3---96589707115.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_off0000de70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE70 17404 bytes
SHA-256: 1a5ff39d54946a90ca270af97075ae71698b98980e69b3ba1892e0af8e92237f
font_01_sfnt_off00010bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 10972 bytes
SHA-256: de700d37eeddc84ea8463c79a801d54d5087af77ac08da58e24441f69720a799
font_02_sfnt_off00012529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12529 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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