Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70bbc6fcac03cfa…

MALICIOUS

PDF

188.9 KB Created: 2021-06-28 03:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc16539844cf2611af126b6f66ec4f8d SHA-1: 65237f282c8f700e5bee7c44d21644afc6b80881 SHA-256: b70bbc6fcac03cfa749b59701963fefb5b09b1b06d3f8bb643bde01dc3d1817b
202 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and numerous links pointing to compromised WordPress upload directories, indicating it's part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a 'LOLBin token sequence' in the document text further supports the exploitation of system commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7066

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56f53420f1---lanufokodemaminorofit.pdf In PDF document text
    • https://avigailpekelman.com/sites/default/files/file/51454057135.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/52903437717.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/75136325822.pdfIn PDF document text
    • http://championsview.net/userimages/34535244415.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/gimaj.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d067452caef---66980532813.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/71934c8e84399fbf2792487abb590af5/76606426407.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/93313385808.pdfIn PDF document text
    • http://vtaky.sk/media/file/55179460097.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/3226506123277291a01bd01cda2bba9d/mefuselutapa.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609451e226141---63604965823.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8184eb5b705d4ff5c414c3a76b6950f9/38077352598.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cecbec0077---87330068778.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16085e0b0023a8---23249512920.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16090593d2d5fc---begulodewevurexi.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/27771573940.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd5e6a27b5---xegowetut.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/sorojitamixexevopenaw.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7eae8f0fb---2812063793.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9b9f36a15a9fb6e55cfce42980480121/44901959250.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608586e377733---75702543962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=conflicting+priorities+meaningPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002c16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C16F 4444 bytes
SHA-256: ca9dfd24b609cbf8d5478cc41b4e7cf844102fd49e794825d8feb0711da109ab
font_01_sfnt_off0002d268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D268 16116 bytes
SHA-256: 8e8a067a420aed03151851439e6bc2fdb6f7f12fc0a4dfa709fd52659987296e

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