Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ccbcf9a0f6ca80…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 23:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cb9982e904e72ee96082982b0deef9fc SHA-1: 9cb1c1de494cfbc5c8d50532f68640a202e0ce0b SHA-256: f9ccbcf9a0f6ca80d9761219dbfe13add0f4621a39d764b191581fc9b47ae621
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files hosted on various websites, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to obscure the ultimate destination or to spread malicious content across multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=bridge+constructor+simulator+apk PDF link annotation
    • http://quiltingacademy.net/fckeditor/userfiles/file/sigixipewazik.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/gexirofijilefirugos.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/75007404887.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/83332710876.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/31520235377.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/91673944936.pdfPDF link annotation
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ef9350358---27848614510.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/zadawamafibagixefaw.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/39782482716.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/71994794241.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/98438751990.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161307ceea9fd4---48236291378.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b11fc3797---fufixedumekag.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/netajamotakowiz.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/finobawarorojaboxomopax.pdfIn PDF document text
    • http://asid.rw/userfiles/file/tuzugirelizawufarigek.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/bipalarojev.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/pimunimobepijikesina.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/98361543434.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/38613600085.pdfIn PDF document text
    • http://uco-kampen.com/media/files/14656557825.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/vosegaferakobod.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/61427813739.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/wovipofavopanupopudise.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/vezusupopodujepezinez.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1631122255.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF47 20796 bytes
SHA-256: 09a00647d18888e43533b8686c97d26d2adfd1ea27895710cbb355638d2b6ef5
font_01_sfnt_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 11100 bytes
SHA-256: 885b06d265dc938fce4000d56743fa9548168a1c931692f72959a363f16d9f38
font_02_sfnt_off00010c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000124a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A9 16060 bytes
SHA-256: 64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973

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