Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd80d9f8f9d2721…

MALICIOUS

PDF

92.3 KB Created: 2021-07-23 05:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 38a299fe4470bebe73e35f21999ddcdc SHA-1: 9ccac2643a3a10071050e252f208cd22e4c7d12d SHA-256: bcd80d9f8f9d2721649c2f7e1220e5ebf47a0cc47f42d256615daba02fdb5c2e
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 as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://mid-europe-ex.com/images/blog//file/zofowuzabuju.pdf In PDF document text
    • http://aps-mes.com/files/file/21414545285.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c540bcfbc1---fajumaparevita.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/7364096863.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62b484a719---74325871010.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/47540379562.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/61084363374.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/jafetoz.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/oohtuaraltp78155shqla60pf5/66642142348.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/f4ierkdta29ohvhlgmqorq0kbl/14393723268.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/48706777070.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/parezemijenagokadewuzid.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/ditofarekug.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/96751892266.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/a350458cfb61423263851cf790ddff3d/37005792231.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbd42e627f---fumeduwesu.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/girizetokulenatenomixe.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/46639948722.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210716054832_6fz9g5.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc884286f1---5331620798.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a0deb8564---roxuluzif.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/cjf6b286fe9mp16hvqr20igjob/ritegabetoxol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+crown+on+your+headPDF 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_off0001047b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047B 18408 bytes
SHA-256: 209d1d448a127740529113ec8371f8b94e8103b3028037c22ef07732469ad266
font_01_sfnt_off00013353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13353 10328 bytes
SHA-256: 88950d5d98a3eff4e198810cb7b219e7a60b17e7d409a1d227ab27c6ce1ac12d
font_02_sfnt_off00014aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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