Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd846bb4a5792712…

MALICIOUS

PDF

86.3 KB Created: 2021-10-06 17:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c0d7a0c5cfdc111c1512a3429758c17 SHA-1: d31ed1fd2f700f72a0bc0cf8aa4840ef3692d999 SHA-256: fd846bb4a57927122008ee525f0c96083a4c3b14c71938f12e5871188d3605d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which are part of link farms hosted on disposable or compromised domains, suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crysiq.ru/uplcv?utm_term=3rd+grade+place+value+test+pdf PDF link annotation
    • https://miguktour.com/FileData/ckfinder/files/20211005_F206A4024633101A.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/10830647402.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/wafisivovesogapapo.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/tosesobazuj.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/90918071846.pdfIn PDF document text
    • http://www.moyekolodin.com/files/ginerifafuz.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/gaxopafem.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/at2mnc1jf3uo38s560jr2g96d1/vozifetipujalerivegixo.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/28131926166.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/9797274280.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/goboxugiwitupakidika.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f304b1762d---1561557563.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/17360395236.pdfIn PDF document text
    • https://khanikango.in/file/xibelinofifawasaxef.pdfIn PDF document text
    • http://drtamerturan.com/file/65754390550.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/jofojajasazejugivokugafat.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20211003_42FE84543363BB4E.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/h864lf7pl7mba3klcotum8gni5/6356872173.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/82639023964.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/zulipopujinix.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/45355188604.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/delapav.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/11106312219.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/40635484895.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/58909841129.pdfIn PDF document text
    • 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_off0000e49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 20712 bytes
SHA-256: 706530bce6f73d8ab91791f03ecd8ff621006221271eef99e7a1078fad3a70ac
font_02_sfnt_off00013305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13305 10720 bytes
SHA-256: 5c69211a488325670e9f978bfa4620f397c2364bc255112ff1eeb50bdbcd7ffc

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