Malicious PDF — malware analysis report

Static analysis result for SHA-256 542149eb8393de1f…

MALICIOUS

PDF

99.3 KB Created: 2021-09-05 16:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 63217ac1eb55153b34c2ad86b59174ab SHA-1: 52363dc7f23ea2c4fffcb76a915f8f760c3a2b12 SHA-256: 542149eb8393de1fb61cdf257b54541701f2b110a1ed3bd5a537c438d92ce706
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic findings and URL patterns are sufficient to infer a malicious link distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://huntic.ru/uplcv?utm_term=gpsmap+64+manual PDF link annotation
    • http://wanyuantemple.tw/userfiles/file/xizopa.pdfIn PDF document text
    • http://headrepublic.pl/images/files/febenunovix.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f9f900f8d---67118665093.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/wawunifa.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/rizuxarobovilokolodepofub.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/74101293563.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0nekh09cffkjn0ppmj8jgt4017/27465663317.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210802_51FDF5748F7A3B40.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/93967745457.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/38777159360.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/vukutumunefe.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/67636030791.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/nujutefegotudezunepemaxo.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/8cf1d05b217fa5d49c0f0aac15dd42b9/wosax.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/xoruforekunekefulabumibaj.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/1s2iabkmii9tvsjvjijmo7tna5/10480784543.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088572db689c---7636939495.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/xirejam.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/putes.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/48563490875.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/97901107341.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/2e213d3021e1a75ac75cad8a81d5dc3b/96555433870.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/91858141236.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/makametiwerutibefotixaz.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_off00011e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001369b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369B 19296 bytes
SHA-256: ea70e25cf6585db0ea4ae9fca5ffa28511275c7a48c0bb9c73d0ba3a1080d697
font_02_sfnt_off00016854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16854 10256 bytes
SHA-256: 75df7a2682f15d41d33a4170a77744825ee8f592c55e7c580f48593464c645fa