Malicious PDF — malware analysis report

Static analysis result for SHA-256 3987975e5943a853…

MALICIOUS

PDF

77.2 KB Created: 2021-07-28 03:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bd79a9810ba65d5df891bae019575e0d SHA-1: 87932eb36e6b487addce2dedde57e6f6771ca099 SHA-256: 3987975e5943a853aac854a8c69d27e488dc038bdf4b0cb9267232df2539be8c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains multiple heuristics indicating malicious intent, including a link farm on disposable hosting and a ML classifier flagging it as malicious. The presence of a visual download button and instructions for a password-protected archive strongly suggest a phishing or social engineering lure. ClamAV also detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://bangvetthuong.com/luutru/files/71654167594.pdf In PDF document text
    • https://12shio2.com/contents//files/55184647114.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/83927120550.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/5497540654.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/5061b6bbde7f5c8a6d7f74e2f6a25031/tegavisowatukexikisi.pdfIn PDF document text
    • http://berbun.com/user_img/file/jixonesuxexowo.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/fewozajajaxidud.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/felokosexunaf.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/47d28bf84f685732feba94976a764345/tinekova.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/nemenalumakajimux.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0305d684e17d6d9f1f435ea5b3bf125b/89364655335.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6ad9a92ca---muluwesibeteluserutubisu.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a052902b273---85215362316.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/h356trl4ljt3it4jvr8d32htas/galumi.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/afac9d1a13a174201743d0126b826e5e/zetowojakupoju.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/99790372214.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/wimum.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/57781364255.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/vebirupozuxaterexeladufu.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/27a9a43365628cf8aed9e88d1dd25e15/zizelaguxirujujurasajofov.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/xujibogofa.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/xejinoguziz.pdfIn PDF document text
    • https://landi-bg.com/images/file/bavikedotub.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/umuqdofi8uiqbpr1djocpc8b9h/kadipuwej.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16090f714e0afb---sitepepifu.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160945f6ac4de6---24497532345.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785931ca7e5---purivalakavomivoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=norton+ghost+11.5+bootable+cd+iso+downloadPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE302 16164 bytes
SHA-256: ba896f586477bb2ca3b3ffda0e71bfc56531575d83c8bf1ddf173a021a2bcc4f
font_02_sfnt_off00010ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA7 11104 bytes
SHA-256: 5c102d8bafb7fe2c6f7dc69cfc71841fa73cc5eee325faed35abef18884146b0

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