Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28d17ed2fc72107…

MALICIOUS

PDF

86.1 KB Created: 2021-07-14 07:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b8a24eb0ada5966a79e7212c7ae77e69 SHA-1: cc7fec63a12a0f9dd6ac34e347d0a1d4b57d6ccc SHA-256: b28d17ed2fc721079933eb654bc2876f75b7c891981ae87026cdace583461e7b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages, serving as a distribution mechanism for malware or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/db8moq34mt1rta97hcqvu5j1h0/2205320961.pdf In PDF document text
    • https://raiporjai.com/piceditor/file/33544322868.pdfIn PDF document text
    • https://viratrip.com/basefile/travelasreviracom/files/81717538962.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/43423266525.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/33525124633.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/mewatejezuladuno.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1411053272609e5da479b19.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dbef3293e8e---kuvubifofiselekuxewoxuped.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ooa27lml0jtbio4f4haf5paoh7/zefedoz.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/rawulijigibi.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c877c160419---25388530752.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/kinamonu.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1273da9935---xozinorekonukugesudezira.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/830139f4eef967c92f90b8c691783584/85623847261.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/jasogarogunax.pdfIn PDF document text
    • https://unicornccc.com/ckfinder/userfiles/files/vibudasib.pdfIn PDF document text
    • http://mousike.it/img_ins/files/temuvamabijamate.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/783a87d4fba38874148af4ecb194005a/wulijasebovupigijiwakem.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/54ef6c5fed634c6d49c65ee8d2fecd4d/sutufetakogerefu.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/35013297789.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/tivodisuxupurajoxa.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/6s9mj90ii6m0e1v1hokjqk74k7/fetipuzuginuvak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=my+farts+are+rancidPDF 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_off0000f003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 16844 bytes
SHA-256: 99d7b2cd20e44a9fd90a6965ff1b9e1eaddfb442211081cea11811cec62b3dfb
font_01_sfnt_off00011bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13401 10412 bytes
SHA-256: 556475c6e0a91a09c53e4757bbbef57add2b449ce63129fc59f37c642729f494

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