Malicious PDF — malware analysis report

Static analysis result for SHA-256 426ec510fce825f0…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 02:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57b7b354910318af48dbde6cdb92f5c1 SHA-1: 03d1fab5f562c968cdf938f2274d3fdb40d60de1 SHA-256: 426ec510fce825f0f51b25712d5e13bc3b9893abf98f8458747ff2fee2e229ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised CMS upload directories, suggesting it is part of a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41699c8adb---54158906527.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/op6kr8luak0bvo8786vnrklml4/41044739082.pdf
    • http://unicaconsultoriarh.com/images/files/nenobevurumize.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/31nnnv0hgmbrdkr0gu136aaqfq/kiruzimaxilijefobopixix.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/4ba02ac4a4274fa8e7c72dacad5c5873/wajekigivuboxobevanak.pdf
    • http://griby.biz/ckfinder/userfiles/files/51341473345.pdf
    • https://morabia.fi/images/file/75163879728.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/9b04673bab5c929e76a6790a3dc9a114/50846981162.pdf
    • http://wellnesszeewolde.nl/site/data/ws/files/41067317903.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/bvr6d2e5q0nio49hot9je0vle5/92628717918.pdf
    • https://smgbid.com/ckfinder_userfiles/files/pazoxuzaxozotefefiwinafor.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b940ad9cd6d2a4d45bf05102f3e9e430/93813530006.pdf
    • http://www.allatpatikapecs.hu/images/file/linojariwel.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100016af1c77---susegaxowanivisesabawowi.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/068d8b13c72e98a5e396047e29a107d7/52763015411.pdf
    • https://premiersuli.hu/files/files/70467478743.pdf
    • https://dodatnojamstvo.com/userfiles/file/mufumisomononosisubumado.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67fa74f1e1---vawunavilasolaf.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/cdge1faajo6ub2bitcvivf0qa8/98965329974.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf12cc35b23---divetunikamet.pdf
    • https://beatmuellerfoto.ch/userfiles/files/xunenokarakamobomoz.pdf
    • http://ladyvenus.it/userfiles/files/nemojin.pdf
    • http://geojeoceanhotel.com/userfiles/file/20210902070558.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=scoops+and+treats
    • 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_off0000e228.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 16792 bytes
font_01_sfnt_off0000fa3a.bin
aeac36c129ecd794dbd365dcd641b689018f4959fd7e1c7cea71e00a0aed0436
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3A 17120 bytes
font_02_sfnt_off00012669.bin
7c89757758df6af4e68d8c42e4a8f0d137e88b0f58db5832f2eed4f7531e162a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12669 10444 bytes