Malicious PDF — malware analysis report

Static analysis result for SHA-256 503c170e9324aec9…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 02:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dafab22dd8034bdb62efd1a71b893f76 SHA-1: 864cfbf0bfd9e85a558c79a33e9f546ac80630cc SHA-256: 503c170e9324aec968751b79e27b5d640dacd6be6ae6d57bdf82fe078155e4b8
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics point to the PDF containing a link farm, with one URL specifically referencing a compromised CMS upload. The embedded URLs, while many are unknown, suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rem-proekt.com/f/file/kizitaxikowoguw.pdf In PDF document text
    • http://www.scsk12.org/policy/files/files/sixazakebigefab.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/72476491637.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/mikitoraletenu.pdfIn PDF document text
    • http://cke.hk/userfiles/75550864425.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/tapiburotedexawuvax.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89144538747.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/40704209949.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133769dea031---zatufuf.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/59137972944.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/jetewulotobesonejonozozag.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/36475542380.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/33901320267.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/zuganabifowizi.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f524f50227---41257553935.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/linemolufapukofotejoxaneb.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/73650902190.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/wukuzemalatufozerufovazi.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///kolovabepakugo.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/wiposeduxekafepelel.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/57500019488.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/rajapoxemovamajigimim.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/68657494092.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330fc6ebd33---39985824694.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/13055730702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=my+time+at+portia+android+apk+downloadPDF 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_off0000dc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 10668 bytes
SHA-256: 770d05a1d36c9bda8e3b120b0e54b2bd6d6e4542ed951ee224dfd46571e505ab
font_02_sfnt_off00010c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9E 17752 bytes
SHA-256: ca116319863b3990d8bb589ab56986399311bc7817e95ff0eaecadbf11f18730

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