Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2155355e6fa012…

MALICIOUS

PDF

85.1 KB Created: 2021-09-08 09:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b25de847630d9a07f541139e39fc1333 SHA-1: 1b1506c83f68909676ba73bdbad0a241a12ea9b5 SHA-256: db2155355e6fa012ff640604a8d556ee9382fba58ab83fe19eac73e4a55453f8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=glossary+of+linguistics+terms+pdf PDF link annotation
    • https://habibitoursegypt.com/ckfinder/userfiles/files/48834495521.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/b4c51a6f286c33547fd4c4130d10ee9f/xasijodopovewapaxojop.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/90936744673.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/5f048afca2b03df15dfeb038670b44d2/puvaxazagamaj.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/54284650469.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/42519b84f37677b0e08ee2d07f4289ed/kurigoluwojaza.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/a5b6f80b00b5ea8a7654d43e4102a727/loledaxisojojepavuretepof.pdfIn PDF document text
    • http://sireny.net/share/files/kibawasawo.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/guzewarutonibudanes.pdfIn PDF document text
    • https://auto826.com/uploads/files/36400832161.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/64787487935.pdfIn PDF document text
    • https://baglab.pl/galeria/file/buzevi.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/33408148983.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/um76ojvgr22t7dfk79scodfajg/lezanokixepasalukadepizip.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608346b82e1b0---paton.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa365cec755---36606033926.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/82257301847.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/c0880cb88ed0e5dc69cb274113adb424/risegasaxidozejipepob.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/piljr76f1brb4mqe7rf09rgd8b/borebimumudo.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/24053405606.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4674d322ebd478a7b724dbe2f3938eb8/22474207165.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/pazivoxumax.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/gapuba.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/kovonokotu.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_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 16432 bytes
SHA-256: 64a9351fa10632717ae65166d520f74cb6adeb6aa43d1eb980e721dfefd7714b
font_01_sfnt_off000114cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CF 11216 bytes
SHA-256: 0bed877d9e5ce778a76db40cc26f8f2d907d9d8167c2a3bfd2d6107706dfff69
font_02_sfnt_off00012ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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