Malicious PDF — malware analysis report

Static analysis result for SHA-256 629f4f62bd23692d…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 07:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e48cb3d729c63459c8ad9f0906309bc8 SHA-1: a8a974c4fa81f7181670bee3d6fdb0b51f813c8a SHA-256: 629f4f62bd23692d7efb58da3924c89342ecd037b9260800e896e0a4b0fbe6a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://cructi.ru/uplcv?utm_term=calculating+gdp+using+income+approach+pdf PDF link annotation
    • http://stattus.com/assets/file/duxaxo.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/vaxogosupulodotiduvubogi.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fd7a8584e13fb75a6b6d87bb00a7e139/kuvonaseviwo.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/90009938684.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1609a17a86fb42---30203567401.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/30679677501.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/61040550013.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161093e2100c8a---45185208393.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/fedowomatofowogewire.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/5e0c68839af2dc2367aa9cf2b878853e/buvelomuguxitaxazaxef.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/27484675644.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/47235274291.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/66883795152.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/93458877820.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/rugasaxiresimizur.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16087b72fcef18---suzunox.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160889ac3470fa---liwipigalojofazinulaveduf.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0fc0008eda3400d5ce37b69eee1c3c80/korusejofixa.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/36415218176.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_off0000d1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EA 17264 bytes
SHA-256: 89bc16c1898c6b63b9bc4366c2ec9f43b6807ee6deb593b38ea68ea4ea3fad8f
font_01_sfnt_off0000fef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF6 11200 bytes
SHA-256: 8396b41bac67adbb80cad05bde63999d4c21c559e935b9cdf9c7ec932e7953e2
font_02_sfnt_off000118c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1