Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d62cd9afcc0cf8…

MALICIOUS

PDF

80.9 KB Created: 2021-09-02 00:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f21032880df185191ba1a89d5851829 SHA-1: 120f4dcecfdc0ef0ec3c075301fac8e588666ab6 SHA-256: d4d62cd9afcc0cf8244dd5078c23fc53a2189d0e3acf1eaaa74580cd5f127135
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a browser extension or update, a common tactic for credential harvesting or malware delivery. While no scripts were directly extracted, the presence of numerous external URLs, some hosted on compromised CMS platforms, suggests a multi-stage attack or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://wastran.ru/uplcv?utm_term=squirm+meaning+in+gujarati PDF link annotation
    • http://ampletrekking.com/userfiles/file/wakafurenidukewaji.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161044b2615080---konota.pdfIn PDF document text
    • http://jinyudachem.com/upload/files/62732138140.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/68389931719.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d7e12a5615bf00da8ff5f974b6c297e0/kosibiw.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/2fa5083d5eef156a608eb253ce8ecb7b/wafitejezibebajidep.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/738lkfl59uute15uqit2ft25qh/68709103787.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/39541384838.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/a6ccc55fb5bee0f299976e4ad6611fa6/80098291876.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/49155871562.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/kelemedigadiz.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ifi2fbkktiekpvd48raj9jvq6g/bazebatew.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/31834537310.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/fakanawaronizoge.pdfIn PDF document text
    • http://atkarisuli.hu/userfiles/file/talepesozumexabizuvo.pdfIn PDF document text
    • http://eternoohydro.com/d/files/36242266777.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/75776026558.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/1144e99b1264c2284060b74bcd753592/52644728542.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/nakirilinuteminafisato.pdfIn PDF document text
    • http://gyobel.itpublic/file/26304940083.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c54a90762c4---11342305185.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3ffc5a3e5---lusunidoxositemufu.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ab75135f814297671519ff5c84de70f5/62923470164.pdfIn PDF document text
    • http://gospelinamerica.com/clients/874377/File/lonud.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/86acd9ec834751eeaf38079acf1a454c/34976164716.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/75625080042.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/lamupizaxidat.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_off0000dda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 15788 bytes
SHA-256: e3f32dd78d4ac947e3f96ff58d191303fbd8e6c6a04fb0292f392551ccb5bee2
font_02_sfnt_off00011ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DED 10568 bytes
SHA-256: b4223695e9b38460f4792c2c1ada8f12f8bebda17399c7be4fd1362379fc0db6

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