Malicious PDF — malware analysis report

Static analysis result for SHA-256 20476ea9d4250ed7…

MALICIOUS

PDF

82.6 KB Created: 2021-06-15 13:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0e3d7ee261c6ccc1c5f5eae8385004e2 SHA-1: 91614b1fa547d37cf7563ca9b988495fe65e1d4a SHA-256: 20476ea9d4250ed7c38bd171ddfe76fb9bf61a24ddda980fe2d17c06a7ff1a3a
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pixomot.ru/uplcv?utm_term=office+professional+plus+activator PDF link annotation
    • https://toskov-yordanov.com/userfiles/file/muwovuxixaveneponibipo.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789afa8b042---23101714721.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/xujenufesedoxug.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/11333315769.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c62276a2207---gozunofinonavikaf.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609646d4be939---mozebojib.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/wodumefutetelanotavanagu.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/17812831021.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/punakobepefigipas.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ob1rj41t36fugrfunoesv9jl2q/80463864726.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e450bd316---bizuzif.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/56894734311.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/6c129e39e627c8388db3e29036842ad1/setukop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 4976 bytes
SHA-256: 9711c70838a7f51eece0f6f76869f68e7ae1b10096ec1a26d0feb6d6c527118e
font_01_sfnt_off00010bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD3 10392 bytes
SHA-256: f7263ca8a9dcde05971743607c1b83c0d354502c21706efb05d65aa9c01d6181
font_02_sfnt_off00012f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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