Malicious PDF — malware analysis report

Static analysis result for SHA-256 413c6c313ecfa8bf…

MALICIOUS

PDF

82.8 KB Created: 2021-10-11 05:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e913871cbe0bfd907f419b1e8c8611e8 SHA-1: d85e5eddfeef89334235d1af701dfb8049d528b0 SHA-256: 413c6c313ecfa8bfa5ffbc87e574cb60677b2096da61b8b2b0bd055db020545e
216 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm and uses social engineering tactics to lure the user into executing commands. Specifically, it instructs the user to copy or paste content into a terminal, consistent with ClickFix attacks. The presence of multiple embedded URLs, some pointing to compromised CMS uploads, suggests an attempt to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://jikaramen.com/uploads/files/75337174588.pdf In PDF document text
    • http://pn-tech.net/userData/board/file/34439846987.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/puvugubemalob.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210915150452.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ddffd6959b---gagadepowun.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/zupowedivulexefumafumasov.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b09c205e68---butexabijonofonebupulo.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/48862815693.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/17218795960.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/lumuzematukomime.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/mosagobuwedi.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/fugiw.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/20495776914.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/lovutanotivobokipog.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/zagotak.pdfIn PDF document text
    • http://philboyd.com/wobemesefaf.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/4491e527684b7f5e3e18f5b33f993bb2/17930532965.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/a97554fb5022717eeff21d500002c327/zezevebewuwikajiwig.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/vopin.pdfIn PDF document text
    • https://plasy.com/uploads/file/tefubirenakeb.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/wovemikiniwov.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/7e6e5e71e01636cdb50ef15375ec0398/vupejotusasalisuwavurotel.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b77355629ea8053eac214e6949542e1d/24628755252.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/kamogotubevegajajalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=build+7601+this+copy+of+windows+is+not+genuine+fixPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 19268 bytes
SHA-256: 2725d9f0502c7cb830b003a17be43139cf1c996987f58c24859eb8be5fbfca65
font_02_sfnt_off0001223d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223D 11484 bytes
SHA-256: 1d56adefef73c632e0430a627b84e6ae212ac4742bff899fe83f42d2ad628b85

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