Malicious PDF — malware analysis report

Static analysis result for SHA-256 5275327520f37e6d…

MALICIOUS

PDF

80.9 KB Created: 2021-08-20 13:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 29471b98b0fa2847fbaf31972ab4fcc8 SHA-1: 9436d5c1aa52a59989d4ce13f4ba4e9b9d00e221 SHA-256: 5275327520f37e6d57b205164d89f321c478a5f07740218d519b3acdd12b24b1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data

The PDF was flagged by ML classifiers and ClamAV as malicious, with specific heuristics indicating it's an MFA/one-time-code harvesting lure. The document contains numerous links to compromised WordPress upload directories, suggesting it is part of a phishing campaign designed to steal credentials or session tokens. The presence of these links and the nature of the lure strongly indicate a credential phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160963aa44d33b---nimebojokiga.pdf In PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/e7bb487e8c214c23394ad12a4146cf40/saxojedebedimixotarel.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/ea95077c385bc92baeca7bfcddb9257d/pevivu.pdfIn PDF document text
    • https://flyags.com/editorResources/file///nizuluranitobubapati.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076e3af294f9---85123521057.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a4d2c2d80---17393961732.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/zumorafimajevuperoler.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/62a2b6ba7e0c4f4c0032d6a00516fb95/77635861501.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/11172590918.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/kelixonij.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/zafodome.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/kunaturegoja.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/0h4s963fl5jdu6gdu9brskbkqe/kaxirotexuxoginuzo.pdfIn PDF document text
    • http://usmleworkout.com/files/file/82667524889.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/25695036481.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/6399072707.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210627051749.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/6b896bd5552763c6bb1ebb0222ec658d/ludizono.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/7279193758.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/fe718ac7f05d551d369121742f46ba56/92848525166.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/6c62fdc0ce0944ef5e7c72d7c24ae5a7/35959426080.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/93596367006.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/bc42b756a2dd5eda54f475b9e2270504/funelidodizesiweg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+print+a+train+ticket+with+pnr+numberPDF 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_off0000d96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96B 16784 bytes
SHA-256: 3db4dc10b6066360e676b7c82b198f1681bc1c1d3c9a82ac5351a75ce25a3bd1
font_01_sfnt_off0001055b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D72 10836 bytes
SHA-256: 7ed4967ff8a9e3451281ea4b52374332d3e0392f75ada0698ecedfcdb35c20e9

Open this report in the interactive analyzer, or submit your own file for analysis.