Malicious PDF — malware analysis report

Static analysis result for SHA-256 212a4d2f803a5fe8…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 01:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e3d2f62594c4f8c271aa27eec597786 SHA-1: 7323683a2b16f40d6ae0c81448862812f78f883f SHA-256: 212a4d2f803a5fe873d15f1e214b051284215e1ed75270c313516220f8fa33ba
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URIs, many of which point to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of a raw IP address in one of the URIs further increases suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328fbe34285---98907745673.pdf In PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072332e3b36a---92190743460.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16097e0ef0fb4d---fiwuxomiri.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/94813551188.pdfIn PDF document text
    • http://web68s.com/upload/files/27996699524.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/dafavunuduwilunun.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b42ca9fc---lasese.pdfPDF link annotation
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/ec01bc9d99c63ae4e8ed8a51a3ddf13e/25231889127.pdfIn PDF document text
    • http://kgmda.com/upload/files/pijidete.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/29445290891.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/82941779974.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074aa4adf9ae---rexibovosekinek.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a42a780a05d---baboravukijuwifumuv.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/2651826c33af448359cbe7d1d8fc4aa7/gafirek.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/280130d59e3055b2bf57db289223338e/sonevupigi.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/onf0veoe5mu19uov1nbvvv3htc/11196370937.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/66587938483.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/fizowunuxizuzuvarop.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ca62c20986c---ritivonatadulexaw.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/fuvekixomi.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/07dm7pv0ul30iq2tqmufl7gpcf/sasaxinarubujumip.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/63703955938.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/vilewimazebowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hypertension+articles+2018+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_off0000cfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE4 18824 bytes
SHA-256: 4a3885ec36d28809e2983a4ff9093d62c35b438ddeb289d069b236defe4ac3d0
font_01_sfnt_off00010087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 11220 bytes
SHA-256: abe083ad7033b467e69b28f68e8887825e12107e2cd1b1e0d5aba12ab89c0bb4
font_02_sfnt_off00011b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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