Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f630c1209908946…

MALICIOUS

PDF

138.0 KB Created: 2021-05-10 14:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ae208645dc1377f3af47bea54839de59 SHA-1: 0fe4635f474134cf828ff350ea2cbf304519fa12 SHA-256: 4f630c12099089465c802a2c35c8c2f464d672e2415fcd576e455390f29e71d8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a phishing and trojan threat. It contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a password-protected archive. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the presence of external links and the 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ba718ae1481fe85764a2c37c5481a374/20454066498.pdf In PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/9c8usb8ko9kuhp51sdoq70pgb1/dofewokovidixizexoru.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/90702505082.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070b17210666---desikovaxirewunawupe.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/008b4e938ca3c276ef177067759fcdb3/zuwazaj.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160771041a3091---52106549140.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/d2982fc40d50a1533ee617024d789c4a/bazofidejuzipuden.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608dea23af35b---56237994504.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/47d10b2df783fa0a0e874b7e0902959a/57646868241.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/vivetana.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee4db8a594---kamavovax.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/kevrku3ggblol6ho2fngp6uv06/45972731935.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/fab5222b2c1df11e42095d0d434091d7/tofoxe.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/aakvjlkns458h6i593rv65bqa6/17442747369.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160701c12d7064---raxipafelikovutim.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607758c4c95df---sixet.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=archydro+for+arcgis+10.+2.+2PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7E4 1684 bytes
SHA-256: 51fdace8bd53b7d2e6af2c0ab3a57c298b99a0f760d42a36c32010743562cd6d
font_01_sfnt_off0001e048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E048 5700 bytes
SHA-256: 63ad1cbf7a37684b785824050565d545b4207bcf3431d03d5a39b4d4ac62ac37
font_02_sfnt_off0001f3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3C4 11164 bytes
SHA-256: c2ee1ef82477cc18b4e4831a4a09cb8278557066d40cb39d0269f15fc5c07c3a

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