Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e84c8b8ec42ab7…

MALICIOUS

PDF

79.4 KB Created: 2021-09-04 04:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 833dcc4901b6e7cbc8a92b911c17dd77 SHA-1: 615bdff1dcf89602003ae1a390039bc4d3d093cb SHA-256: 87e84c8b8ec42ab7cf7b498678ce1ecf91c9f44a240905043fc4c212097cef0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is used to distribute links to potentially malicious content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drafthe.ru/uplcv?utm_term=solid+liquid+gas+and+plasma+worksheet+answers PDF link annotation
    • http://fitviewer.biz/files/file/mimasesile.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c87ac10f46---poxidijizekuwa.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/wakujewilupokego.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093b44d07d76---fukufon.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/40716217577.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/86988026555.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/83524478175.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/85899586218.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/773af630fef61bef06c9a08655ef913d/35591276005.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b105cf428---gabusutuvegofunotu.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/motuditelun.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c85f1b6f6ef---wofavisan.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/zaxixar.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/60922877793.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607138b4bb97b---56061614148.pdfIn PDF document text
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/xapivizumijukadibaroke.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/xomazugi.pdfIn PDF document text
    • https://fuoriscena.eu/file/16257831818.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc590dd02a---boxadezujekep.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/80839055589.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2tpdjpep18dc2fvtq1hvh8mtt1/jekexiwesemavatali.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/52246451187.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_off0000d213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD213 16900 bytes
SHA-256: e294b7bf6f29abc06d141d0bb07c92330722bc6530203ad7e5be027970aa0e08
font_01_sfnt_off0000fdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD7 11336 bytes
SHA-256: cc9a01a7537dd7050152db0c33aebe491ad0c7481cfb0e3cc613cad080d34389
font_02_sfnt_off000117d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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