Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ec1846d64206284…

MALICIOUS

PDF

85.8 KB Created: 2021-06-27 23:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a04caf815ad1e6dee8d4fe9aa94cf77 SHA-1: 4c23f5f62c3e1ab05ad78ed35b3233dee0b730ee SHA-256: 1ec1846d64206284dda1672645282f543466302f94185a4bc0854131d85505b7
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to manipulate search engine results or direct users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://abugfreemind.com/userfiles/file/bawenimut.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-6-13/20210613025423791864.pdf
    • http://nw-line.ru/generic/uploaded/detegexi.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160cfed9077e05---wunovilenagedomaku.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c20a62fd30---merivozukonevezuliku.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095db2a53345---xivovuro.pdf
    • http://kotolantopeni.cz/file/21184188969.pdf
    • http://bassbasement.org/userfiles/file/64229757393.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/634212270c6c05e5c99b87f06632f258/10040448868.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/0c445445d7c394c5670431f684be9c53/80741757552.pdf
    • http://fine-cottage.ru/userfiles/file/nulizeko.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/03a220e9f472567fbdd368871df43149/15788048193.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/a5f2141dd98920f791c93586de0e6f6c/83943074521.pdf
    • http://alexlunacoach.com/img/editor/file/93331127846.pdf
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/11146611959.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a70ffd61c2---9872009357.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a70ddb78d---75790359668.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d51ce40fa3---75835778854.pdf
    • http://northcity.rs/slike/files/bomotudakutixeram.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/9f69c03876e3cd9fd5be32b329e522a9/lipiwasovilorilelis.pdf
    • https://sharadsangam.org/UserFilesTwo/file/77812502436.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=obs+studio+download+free+full+version+for+windows+7+64+bit
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ff.bin
caabb5d5f0b9fb11236b26fd512051cc7265e9758f777c651ca6f606bf0a5dca
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FF 17012 bytes
font_01_sfnt_off0001155d.bin
f577bd2a73fea416c5aa7aadadebaae9da0d6f055a6f4896523ca46a636a80d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1155D 11060 bytes
font_02_sfnt_off00012f73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F73 16792 bytes