Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bfa364692794fd…

MALICIOUS

PDF

78.2 KB Created: 2021-09-04 06:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e9e7578dc701ae50e3c7637e09f70d09 SHA-1: 6708dcfeffd1db27aee7b6c5fd6eb82d8010c54f SHA-256: 28bfa364692794fd47dc4758a7a0dad0874e8f594a981b35d88d4ac6921385d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/i9obp1774a4hk2udhhmgnhe7l0/botamawapododawasa.pdf In PDF document text
    • http://vom-ragnaroek.de/uploads/file/jusawumabukinunodudajifa.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b524afef1938d1f4ac2894137b808acd/89524902602.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rajenevafiwotakat.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/wuvigutidonagizuvoxekakav.pdfIn PDF document text
    • https://coevent.ru/upload/files/fibapikasonev.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/50nmnitqtjb784j2u452nvk0k6/lerulowufoxax.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/4c2b1904437bbf41b3e40c37dcb78dcd/fezefiwiruxeliverub.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/kp9ug00a7igfh6vqod1hthtsf7/bunaxazuti.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/wutovofowawilobuwutifora.pdfIn PDF document text
    • http://cordovajewelry.com/images/file/tarivubofozasimukofefi.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/43f683b23850a83c50507b60b70255f7/kudufizas.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a08264b1d36---gitikevomevapenovaxoxi.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072abdea7620---72790428973.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d7c970347---jivawutun.pdfIn PDF document text
    • http://hsse.cl/files/59703407592.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202108241111374554.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/jofukowuxufojinugin.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609878c815772---63256616651.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607387c3a509c---fulesalanokidujipujimet.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/96815803544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=make+basic+arduino+projects+pdfPDF 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_off0000c9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B5 18152 bytes
SHA-256: eb52264ad07e28e4dce747095bd8153934f4ee1a8f9e20ca7e13bcd003564459
font_01_sfnt_off0000f94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94C 11020 bytes
SHA-256: 0a0109f4122f7a13b77dee1a0e338e8f4ea2bf165918ca546b13edc309e7d822
font_02_sfnt_off000112e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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