Malicious PDF — malware analysis report

Static analysis result for SHA-256 89505cd8b63d0afc…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 10:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5a4011460705d89aeede69e10dcf111a SHA-1: 3c186f6be23bbcae2ab5877a8586e30a35f3d53a SHA-256: 89505cd8b63d0afc198876f226a97af103e6611e1c65a6ddde92cc3581d729a2
176 Risk Score

Malware Insights

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

The PDF document contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document prompts users to call a phone number in a context of urgency, typical of phishing or tech-support scams. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nomylo.ru/uplcv?utm_term=avatar+telugu+movie+hd PDF link annotation
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391af996bcc---lifunakefapudugevojezubur.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/83115453865.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/dazikizodesixifumaw.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/zotezusazajitigab.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/fupozopefowevovexe.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/66e16852b4b9d3af07426f31903e60dc/bitiwo.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/dagomi.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/58271964893.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/kutaxati.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147afae05d7a---ladawanezipis.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/tisovurufel.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161336ac990e95---tonepin.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/68923273423.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c060b0aee---futapifubasu.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/pazoxopadulagubijujarisof.pdfIn PDF document text
    • http://erdbau-rauch.at/20702591997.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3e2ee99a6---tezori.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/fojexubodabulezumibate.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/vevesisozuged.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/jatopunobodonalazamijejak.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141e07b6b412---wigevemeruxozarim.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/pawudafuv.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/nanavexitazubokoda.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_off0000b10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10D 16380 bytes
SHA-256: 21a8922a98e0627c9c187ba49d910cdc4021110917baae161efa079a72fe075f
font_01_sfnt_off0000dad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 10572 bytes
SHA-256: ae3c0093879b6a12d05bb6515ab13c9d9dd13e80f999818fdeb696a87e75aa01

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