Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f818840f6452b4…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 01:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e78774f366adb53c921238e9a9ee2e0e SHA-1: 9f6a253e7404a1628c2067e555c8bd2ca073e79d SHA-256: a8f818840f6452b4dc5d15eaf505e1c4e83ef9868e9c4dd7d9abfd74621228fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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=ultralearning+master+hard+skills+pdf PDF link annotation
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d613f550eef---90493644723.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/gibejomasitulopef.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109030841234009.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/lesugelosiwotobagamiwe.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/dizogerivukige.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/fojarubomi.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/4306f5b98c32af0ab9da3fa1b6b822c0/minurejodilejazofi.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/52551757526.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/99927844908.pdfIn PDF document text
    • https://laps.pl/userfiles/file/ginuxetikafisew.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/80b75354218df2a248e3553fd614e570/13538629543.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/18319567901.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/25705c94ccc03da2bc12cc41f9b64b50/xiwibukazudalomotox.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/53444426209.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a889688781a---32282066097.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/robonuxawujuvilugo.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210806102043.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/11175532822.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/25156235105.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/sutemawamomijupe.pdfIn PDF document text
    • http://stroi-sistema.ru/img/zetep.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/botixedamag.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/livivuboxolarolomasaxudim.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607709cb7de7f---ladopuzi.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/litex.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16071459a2c122---fixamotevat.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a658188bd4d---11732450652.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_off0000dcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF3 17580 bytes
SHA-256: 5d23675d6df7bc506d094340a49d6d17740334d8a7ab67a1fb8a381869097dee
font_01_sfnt_off00010a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A96 10924 bytes
SHA-256: 907d07bbe0a067ed7dfb8a9e15778572a9546ae5db1e19c40af3b2425d18987a
font_02_sfnt_off00012374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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