Malicious PDF — malware analysis report

Static analysis result for SHA-256 4900f0bba69ea199…

MALICIOUS

PDF

82.4 KB Created: 2021-08-01 09:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1421e9de5a529483da9d3066b7c17715 SHA-1: adcc199faa61ab5779799ee24e2192b3ae8b770c SHA-256: 4900f0bba69ea199a786b5524794132fba28e599623793ffca30c9574995f6b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and is identified as a link farm, likely intended to redirect users to malicious or phishing websites. The document body is unreadable, but the heuristics indicate a pattern of hosting content on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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=dolphin+emulator+android+new+super+mario+bros+wii+xbox+controller PDF link annotation
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098f26f135d0---3716337419.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/narade.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/4533468108.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/6e0f9824aabaad1a60bc7c5c26159560/zobujamemazeruf.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/955bc22b8076ae02cc34bcb9a97f603c/panerusejipegut.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/10714708725.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/31abbc6bd456299dd2fbd6a7ea447975/zeribapofebifigo.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/6177750319.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ee5d2b229f33718cf788140a687f4d28/pujilajijib.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/98e51d95d2ec5c4d7189f3ea6ea2b5de/63875166122.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf1cab8f74---zuwub.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e109bcc32---17658075030.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607587eba0890---gixavimufafemodub.pdfIn PDF document text
    • http://bscartridge.com/pic/ragowazifilumatedifafutam.pdfIn PDF document text
    • http://c-amc.com/upload/files/dulemajujabawifapifatoge.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/d8f7c3569b8b71d9403c27c00d62763b/filedilugupajejoxeros.pdfIn PDF document text
    • http://chpcentre.com/files/file/63788873027.pdfIn PDF document text
    • http://carsonandchain-ip.com/userfiles/file/worawelowivexarodonibe.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/4791222937.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/ripanaxuvigamevulavi.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/zuzavikubelutulupelat.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608904294198d---nepilajorali.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f0208233a79410ef01d958431f018e05/kafel.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_off0000db45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 11208 bytes
SHA-256: d76fa3c41a235d934a2b9415d227a4bbf025ba4e70cd7552908fe59992be8665
font_02_sfnt_off00010d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D38 17216 bytes
SHA-256: 367655417fd3a8f36e1b76cd3deeaa18811b099e60c0735f4e9eafc0c39cfe36

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