Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba513f3486ee20e…

MALICIOUS

PDF

100.5 KB Created: 2021-09-04 22:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bcac1559336171be742189ea2eff719b SHA-1: 08065cd838850367c7d41efb86d1a046ae92887d SHA-256: 3ba513f3486ee20e8cf666f676b8b589def75f2556908ad7a23cf86cd6e65cbd
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, several of which are hosted on compromised WordPress installations. The primary attack pattern observed is the use of malicious links to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://southfieldhigh.com/clients/a/a2/a202dccd336a30abee2d0a4364b9f07c/File/xinivofozotasa.pdf In PDF document text
    • http://udmvdpo.ru/images/files/50122593091.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/geditefajusowo.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/jipimikelomipafopoput.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/lugumevofawavitij.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/diwapomitefobo.pdfIn PDF document text
    • http://artospace.com/pics/file/nakexiguwotujazuxufos.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/85314277347.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe249b22f2---zegemetozusolilum.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/d0445d3abc6f768d1442344e0f6c7da4/nirilek.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/didufip.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210731_C6BC25142D90DD0F.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/ronajomazovataluf.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c729d23a864---43971225155.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/84859782574.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/51796240296.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce11ebfdf8---55213070219.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/51829313759.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/jlp1rib1paqosm5dlfaifjbvq1/wadinigixofefemig.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/5373372948.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/35584166246.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a6a89459f---mubovosijuxulabar.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/wezetotevadeniluko.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/62943987054.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/f8d9339a51a30ff3176806a9b1f7bb29/29004318411.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc8f8a35f10dd4e37fb043030d2f3a6f/fokobegomemewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=amplitube+max+manualPDF 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_off0001190b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190B 23344 bytes
SHA-256: 0e726f263a77566d4b07178e57885ea062edf98ee30edfd0d55f7926a8901455
font_01_sfnt_off0001553f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1553F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D56 10348 bytes
SHA-256: a920b52a502c0c611b6405ee8f9c8277f010fe67cecd69f0a7b508991a3f4366

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