Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a6870541e1fcb6…

MALICIOUS

PDF

82.1 KB Created: 2021-08-31 21:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 80e872ea474e041a92f237bb3b30a69e SHA-1: a1ad3f68650b738382d3fdc37cfb00abd4c93296 SHA-256: 51a6870541e1fcb63d9f3e3898f8de075c9ee9aaddc0e01d9c279e6219c7781f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

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://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/a4b229ad89da3a5b29469fbb85b80c16/rupulapolumakutube.pdf In PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/zuwebivadagobiliko.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/96ddfb6c7152bbfe4fe421fda6012c57/tevipik.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/vodagubipiza.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/mewidi.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/34063876168.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/fawebupop.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/8040973941.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2777a05d1---90132919318.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/vefobuwunononoxevobokodix.pdfIn PDF document text
    • http://newo.ru/files/files/68970492368.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607136c4277f9---foxiz.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/vupupotakojabivimaxubopo.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ff7805bdfc58d783a955500f1e3cea35/37315871761.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/62573178381.pdfIn PDF document text
    • http://topas.lt/userfiles/file/79218488592.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/fd25325fec927f46f030b08146dd1930/diwilivafuselivubolime.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/14069621759.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/53963977114.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/3848892a8498adfce1c1f10642cf0d53/22627901912.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/lepesevetoxo.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/8e3673ff27e5b30a708761bb6936423f/mudutomezabuxofawumip.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbc09d4c393---22412959638.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723c70f34d5---vopomirudevo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9afe56cfab---93659068863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+you+put+echo+in+pairing+modePDF link annotation
    • 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_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 11036 bytes
SHA-256: 86e27618e46bface7850ef59f3a41c328d228ea0883bcaef89dd1fed3eba8dff
font_01_sfnt_off0000f46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46C 18060 bytes
SHA-256: 5679d356ada28260cb91d3c0c06c6916b1d98ec44e0cc9deffc2e08bcf1778f6
font_02_sfnt_off0001232a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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