Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc23c55c90a84092…

MALICIOUS

PDF

84.0 KB Created: 2021-08-07 06:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e1d8d522dae03540899f24dc6dd0021 SHA-1: 819cba5dbcd33e6a0498380d4bb83e1dddd4d9f5 SHA-256: bc23c55c90a84092f8788391f2836d2348bbb6590497b64a54b6cead65292040
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to numerous external PDF files hosted on various websites, some of which appear to be compromised CMS uploads. This suggests a tactic to manipulate search engine results or distribute further malicious content, aligning with phishing or SEO poisoning attack patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://wjcopy.com/upload/files/mukaxawimuxa.pdf In PDF document text
    • https://memoservicesrl.it/file/27016885250.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/99798501923.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202107130917455500.pdfIn PDF document text
    • https://robertbah.si/files/file/97589701284.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160944ce546a8c---bojudidiwulijazevekafog.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/r0c1l4irio2efvp2h7i12ve0r3/86082889478.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/nanojasizoxelobisofem.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/kilezavixenaripax.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/pup72lrt5pt1k520dcn06gr00u/lidozuninunudumeze.pdfIn PDF document text
    • http://mextro.de/upload/files/puritaxuxuguz.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/97598089811.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed3b9359d0---85582749760.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afa26d59a48---roxamagebiretejivoveniw.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a442ced0e66---54745759264.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a731f285fa2---41529316688.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/26933971902.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430031031570442.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/22346868199.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/misajozanal.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/f62de136b0a8524a0bcb58efb9f27d74/62474633808.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/lororonuterasirur.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/fobepozekemoj.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ac48f2a8e68---kaporenisibixuxokuruw.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/897796b6d04f1ab617bd7d958253ffc9/silogipafidugafivewaga.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/fiwisateduz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=air+pollution+control+a+design+approach+solution+manual+pdfPDF 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_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 11148 bytes
SHA-256: 604de1fd3f865361940e858b6ba32f060a1043920e9a8e9e1b69db0907b8cb6b
font_01_sfnt_off0000fdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11601 16680 bytes
SHA-256: 758cc9b904d93395621490fc90128646809e330572b2c31f2042a6f868dd01f2

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