Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fde99caeff4ae8f…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 00:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 31598584230361e800f1bb6c75311e30 SHA-1: bd15ef62a5fdafe458152d4a925dfce2899348e7 SHA-256: 7fde99caeff4ae8fea1dcb46ebaca18a544adfe8c345661149076176b24ef6ec
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits malicious behavior, as indicated by ML classification and ClamAV detection. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs users to copy and paste content into a command-line interface, a common tactic for executing malicious payloads. Numerous URLs are present, many pointing to compromised WordPress sites, indicating a potential distribution or hosting infrastructure for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://nomylo.ru/uplcv?utm_term=converter+pdf+epub+free+download PDF link annotation
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120dfbf949fd---61117320337.pdfIn PDF document text
    • http://aweibel.com/Photo/file/sedisefiduzubawavunegu.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/gulofunajaxunujuribewuso.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b72e5d6533.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/kmpuv11742tv18hqhbbl41c4k0/8619861434.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210903_5A576BFA6686B0D1.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/zepuruwisexa.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/70756880723.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161007a4d36ca2---wanefarepusilo.pdfIn PDF document text
    • https://mfdesign.hu/files/file/fegenubi.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0501b58f3---wudapumedigunefon.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16092579b9da90---95571699680.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/12999273812.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611ba1092e712---wopejimorifukun.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/b9afbdbbd3fcdb7ad969f5c0484c1642/4605364148.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/c13811191f901f296982ab3472948f80/jinataredozal.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/63152690366.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-9/20210509060325460430.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/8c4ad4dc9afd323764603c4517b44b4c/sunonorodedajupak.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/8542902760.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e79dd29f5---51905901087.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16076ba4c75f85---seseweninofaseworusojo.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/10377529139.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_off0000e407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE407 10652 bytes
SHA-256: 8b4319a75aa849debb265e56fde4a3ab1be3fbf48bd37200eb8352f1d01e2944
font_01_sfnt_off0000fc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001147b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147B 17716 bytes
SHA-256: 1e9dbda421482a7c0d3526ac723bd0185885bf873400a05a6f81ca1fc1539dd5

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