Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb88a79fcf277be6…

MALICIOUS

PDF

89.4 KB Created: 2021-09-10 06:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 303b34a57961e8147cb5f3788aa02aca SHA-1: 9ea3b1df6cf47467f84cbbe8317d3ec617673168 SHA-256: fb88a79fcf277be6f8ed261d77e37e28a253e3b347e8dbb5babe91d6bcae8510
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://dhleisure.com/ckupload/files/jojopepebuzixugit.pdf In PDF document text
    • http://mitcostruttori.it/userfiles/files/51019499236.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/77604106229.pdfIn PDF document text
    • https://profm.hu/files/file/38122595617.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/jenadejaxitipovojatilaw.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/11381956274.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/redezipuru.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/tujofusirajag.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/ronoxukejukebupevuz.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///fotuzuzabawejak.pdfIn PDF document text
    • http://birdwatching.sk/media/file/88854920616.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/84229173399.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/069e4f6d590b375ebfaa267b0df416e8/83973697574.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613998854e98e---pijowo.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/50474314359.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/mamebetodiriwuvanap.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/xifugatazomugijuxogeneguv.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613791167adc4---46552983265.pdfIn PDF document text
    • http://risme.vn/files/2152776005.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/93002578138.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/gokixuwokamozilujuzel.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a829d4a095---22481963861.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/sagavab.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/tetanepupidefu.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/raxobadojusaputiroduduxuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=five+nights+at+freddy%27s+1+apk+fullPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49B 11092 bytes
SHA-256: cf62194321e3fd54b0f4ce7d6840fb088d366f6f61d4b2a5d018924d033e9907
font_01_sfnt_off0000ee4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 22556 bytes
SHA-256: 5aa5b966eff5aed3cce3d9709dc7e96f6586207c5c89d4d0a6ccdc787b2eb307
font_02_sfnt_off00012960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12960 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_03_sfnt_off00013eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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