Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d50a1587dec5bd…

MALICIOUS

PDF

80.3 KB Created: 2021-09-06 23:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 11f82c471d10bf9bfefbef4abf44b372 SHA-1: d2ba6f1f0d9256ec4511d5a0976f58737d68ce70 SHA-256: f6d50a1587dec5bdc7c9e434feb006cdc9246966e244fd7503bc5b14a60439e3
126 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure victims to download further malicious content or be redirected to phishing pages. ClamAV detected this file as Pdf.Phishing.Trojan, supporting the malicious intent. The document's structure and embedded URLs suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier clean score 0.2429

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://iccarrentals.com/files/file/79284731362.pdf In PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/98a6ada6e310ca6dd8ed685d7954b9df/91992332104.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c75bdfd88b8---89705147340.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af74e213665---61278870569.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/b5dac1bccde1aaedc5c1fb2148a226a9/28170576037.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/65527981062.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/gikib.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbdcc3251c---60171668922.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105ca97e8508---85044221580.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/96956050054.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4e2e785de66d9bab5abb1bc70b0fc659/guratikekoduwubebovipexu.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/fudukavibiranipuvirivo.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/kexumixogefepesozabo.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99f19361b---23870827805.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/26bd1edd3b07f8b6526a2d9ad854fdfb/fabugevuvirobadagifoxejul.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/38855123275.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/8767fa311d7a4e1ce1dabde5f540a8cc/83654174502.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/8144912931.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/natororelavivafawabebina.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b291366eeb---pesawabazotogajisene.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/boribomawikerixadiv.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/e5421a782c689bbf95e1fcb23f52fe9c/dapame.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/32463566406.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bf2367310---5393138280.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/novoxaziven.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/90833190593.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/75a9a138e5c413dca2b997d86b7f830a/xojukolatetoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ars+goetia+pdf+completoPDF link annotation
    • 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_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 10840 bytes
SHA-256: 91d76d22e971b9a784ce3f0f19f34b4bb01611ee82b73f9e3c385caa9d59d428
font_01_sfnt_off0000fbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFB 17296 bytes
SHA-256: 479cf0aa6cc5fd7e2effb4cf7d5716fc29795e180b4275527bbdddf7684c8f3e
font_02_sfnt_off0001290e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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