Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee291cafa99db23…

MALICIOUS

PDF

108.6 KB Created: 2021-09-05 01:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8cf51741dc6350b4dfdb5c3fd457026e SHA-1: 7a7f4b1394b65695fdd8ad2565d664e1d9035c68 SHA-256: dee291cafa99db231d755aec68487e70aae458eb16ee2784085b12699ce11551
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The heuristic 'SE_INVOICE_LURE' indicates a potential pretext for the user to click these links. Although no scripts were directly extracted, the nature of the links and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://chcial.ru/uplcv?utm_term=manual+de+procesos+y+procedimientos+ejemplos PDF link annotation
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/cb59fbdbc24d952084a059dd4e32f861/jimulexumexalapotevebupu.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/pelovovemogafatakugukaz.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/60122765940.pdfIn PDF document text
    • http://hydrem.ru/images/file/51155365146.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/7piahm9u98fbatnm9v13vvmn47/97343668241.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/ad25ad33f842a4b6f7b9e35fd7d9d840/bagabagixuvam.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a64fbaf476---43008711055.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/99641801291.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076199b61e1b---vubolodozutu.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/54010708848.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/7027178234.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/xanudugegek.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612b5e1f12523---sozigubebu.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/42424159422.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/miwovuladufonanek.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/58c441e79ab13da02531c6fe7ba8dfba/pevajazugexuwenudavadoz.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/8qmm4j2j9kk8nvqbs08j3dcfn5/powapiwoxo.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/7c97a70e5d16d4827aa7ead9251cdf6b/winalepazekurirazal.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/7brud9uijlf6qi8iemt94gts75/bejokosaxejevidipebikadaf.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/8771348843.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c14709f3c---pagajadagavetaxunakitegaw.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/79852815484.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/mebamafolofoju.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/66150737763.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ef71e4866---sekukoripulevupuvupuk.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d0f499fe---rakusin.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108887c5d964---bejovunuvatezelikezir.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_off00013ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000156e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E6 19984 bytes
SHA-256: 7ba6c11361e4959a86b90335b951e49ec9a29851adcae899fbaadd7ffecfc88f
font_02_sfnt_off00018a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A21 11012 bytes
SHA-256: 5613c286ede6d25577db2d72f9f76e398d7d2b121381f524b0feb633e88291b1

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