Malicious PDF — malware analysis report

Static analysis result for SHA-256 3deb5d1a4379c1c2…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 12:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 880d76cd3d4c79413927e267e1ead585 SHA-1: 9d5e6b78a41dc73206f5a89637271e6f2e077a22 SHA-256: 3deb5d1a4379c1c29efa7dd1c7868de876b199d375d74d67e88a34d2f0b68cc7
172 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains an embedded JavaScript stream and numerous external links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=aplikasi+edit+tag+mp3+android PDF link annotation
    • https://bibonatura.com/ckfinder/userfiles/files/patiganerawetofitifa.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/dewimefuwubaxax.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/baxuwuruxuvebolabokizipo.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/et2p4d4oce03vnnrtpdc1gq3vt/64700903556.pdfIn PDF document text
    • http://sjhtractor.com/d/files/22282951628.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/14692516417.pdfIn PDF document text
    • http://topflexsports.com/uploads/dulexokajug.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/xepiwelu.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/xofedefunusukuliwuxe.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/cbed57f0059a17e6356fc171bdcd4100/35609778700.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/94875478779.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210903_7824f.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614343472dc30---kemetugivuzetux.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/rufekuziwoxuwasuligajo.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/9712876989.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/xevusufura.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210909_014621.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109162155401976.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/devunamegidarilulozu.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/dupulazonuzipad.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c35ef1003---31150183303.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/23475006742.pdfIn PDF document text
    • http://email-database.info/userfiles/file/18347183664.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/fb4e5287f2c04df509e1720b2fbb4eb0/65816648259.pdfIn PDF document text
    • http://montesantangelo.it/files/files/81993593552.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/rofatawes.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/69346606695.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/tozisaguropoganabezige.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_off0000d74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74A 16756 bytes
SHA-256: 67828ec334e832d43f7a350580b9850c61ae6cde67976a7b798e88d2d83c67f4
font_01_sfnt_off00010298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10298 10980 bytes
SHA-256: 2c9b693ce8d4e1e1c8a7235492189737ed8394a598a37f53542db9fedfb53187
font_02_sfnt_off00011bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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