Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74fe0f5426724b2…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 16:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 97d77d82062f635e4bb76489b4226e0c SHA-1: 644497df115c3fa3353b9e5efdd6756c6e377f9b SHA-256: f74fe0f5426724b2a21ef13d588bd147658fbcea05e92c46c6c604578e843b2f
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://catamma.ru/uplcv?utm_term=concatenate+pdf+foxit PDF link annotation
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/vrlcae030mjqije9j4mq4miuaf/57529943548.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/64910334759.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/13551198229.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/32454670415.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/mozusam.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/6775300946.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878d59dded5---52280828555.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/vilovilukaso.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16094976fd0d96---36052368382.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/samivodamuw.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210612050512.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/wumelimijebawiwinil.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/29798591042.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/19425584887.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/kisc9elee3cjnte232ro9eq77d/xalamowadolezobavukexero.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/loxadokoxulasaluxapizema.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/ziwafasibojoxuf.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/gavasov.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/tajoxuda.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/59928030014.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/bavuniwaburorodupogutoz.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/dujotobajixivaj.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/xozaxuwimibonabi.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/56318182418.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/xemefonila.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612055a68222c---83668622045.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_off0000d4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C4 18072 bytes
SHA-256: 6af9fafe124bb2f9bc7b4afe0eda96df4000f10d5c5ec83a295b523f3825101b
font_01_sfnt_off0001037c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037C 10432 bytes
SHA-256: c56f7db53405df7f8d7ed5eb94dceb5c211ca1d533dfff9dd39fba57d2ab1268
font_02_sfnt_off00011b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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