Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f4a1e6315f92ec…

MALICIOUS

PDF

83.7 KB Created: 2021-08-29 18:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 98ca8b8c800cc35d8bea01972db8cd6c SHA-1: 9ec3c01e671c7af3e46487e6fa8dd43aa94c26e9 SHA-256: f6f4a1e6315f92ec8f56bf455b11117813bf5c11888704107af1715315594c97
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, specifically employing a password-protected archive pretext to conceal malicious content. The document contains numerous links pointing to compromised WordPress sites and disposable hosting, likely serving as a distribution point for further stages of the attack. The ML classifier and ClamAV detection strongly indicate malicious intent, aligning with a phishing or trojan delivery pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://laborke.ru/uplcv?utm_term=bollywood+evergreen+mp3+songs+free+download+zip+file PDF link annotation
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/p0epc9lf78fhj0th9t6l7lm87t/bufurureveredenusowavi.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/87264643822.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210813/file/semukog.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/6c214c02e3e66bbd29e1de9bb27cfcf1/19409618799.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/69570810604.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/safula.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/e261d8f7e6fc5c95c5ff659dc347c0a8/wuvonogilojoxina.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/2102995747.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/levebevufanusesefumoja.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/midezebevotomelokakopumet.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3739236fa---nifenunifuduputa.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/41073468549.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/resufewikibasife.pdfIn PDF document text
    • http://zcapitalcrm.com/app/webroot/uploads/files/taser.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/xupiguzo.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210710_193637.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/lopikan.pdfIn PDF document text
    • http://newtrierreunion1962.com/clients/6/64/64567561842b0bbd40b956adda0282a7/File/28979742236.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/rodijaxugojedopabeputobej.pdfIn PDF document text
    • http://devison-matras.com/upload/file/77972537990.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/1bb8ff4fb0591f73ba05f80be036ce02/10208576412.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/gajufatojosubezud.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/83cc0db8a95b80343c7833d3de33711c/92350782941.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210823_102644.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93455e60b0---talofaxoradonexigolu.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_off0000df1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1A 11292 bytes
SHA-256: 6a15f2570f2660e399a117c5b6c1f4b9ba85970e57f2a2935a8df9eced53a0a2
font_01_sfnt_off0000f97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97C 17984 bytes
SHA-256: 201a1d4c09bb116492ec07e36d140c2581eb6c9d6fc6c51364da2b681fad9c03
font_02_sfnt_off000127c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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