Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8a8d644fdeace3…

MALICIOUS

PDF

85.4 KB Created: 2021-09-07 20:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cf499031539ef6cdbce25fbc15968364 SHA-1: 2242824176edf5177c5b253c34dd5db9bbe56538 SHA-256: da8a8d644fdeace36ff29ef8fa7f28a2f82673fe36c053657276df67b6dd784d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document instructs the user to use a password for an archive, a common tactic to evade gateway scanning. Numerous URLs are present, many pointing to compromised WordPress sites, suggesting a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=pdf+passwort+entfernen+freeware+mac PDF link annotation
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790e4c0188b---56770831205.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/dewosago.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/9291847a7263e050cc839a6bbb151a0d/78492124663.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/37780506950.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/vstgip99hd1be6ma22gjc853iu/94125441693.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/7157955a0a427be114ffbeb3c1fc33b5/57925225552.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f7d64f676---ponitixukekidabak.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021071704444973499.pdfIn PDF document text
    • http://e-hematologica.com/users//file/26778843971.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/62712714328.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a736b0afa8b---lerijinujegikotazod.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077695850dc8---bubezobafadebexawuluto.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/5317146470.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610ec406e1401---dodaxudufexiveve.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/14752336780.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/19824550097.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9184be9df---33080285298.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef18a54825---sobajifa.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210616004243.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210814_C6F1E085360B0320.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/rasimuzip.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/5e957ee526f5e97231139a50243858db/14701436562.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/lidirijifeke.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8da5edfc7e---pudejoviw.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/diwenivevaw.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_off0000e654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE654 18600 bytes
SHA-256: 76329b4c14a7d7b02a519714bb74c86924c8ad48beaa03a177c6a244fc17038c
font_01_sfnt_off00011532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11532 10732 bytes
SHA-256: 7613bb1fc6e47a8dc830b3c6e0400761ad2a20ae1bc35957539c2ae91b6b5ddc
font_02_sfnt_off00012df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.