Malicious PDF — malware analysis report

Static analysis result for SHA-256 61fb4480bace7210…

MALICIOUS

PDF

91.1 KB Created: 2021-09-11 02:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 573d69c3f8ad604c37af405106073bfd SHA-1: 9269e8b37822b2d90dcc4e1a4d7e94e2d5452bd5 SHA-256: 61fb4480bace7210cbdcfd6b8f668073c020e14b723a13470a52a0f30ea43f58
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://kientrucsangtrong.com/plus/files/11326647924.pdf In PDF document text
    • http://valeneighbors.com/userimages/97121956246.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/kupemunifaloroji.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/736764357.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/zexoz.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/63662705316.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/megejojas.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/68jp8te6klhnjlo76ll17df6uu/waxesewitukevojef.pdfIn PDF document text
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/78066395366.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/18331809589.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/12358291039.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/77252474072.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/72267481198.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/66966647146.pdfIn PDF document text
    • https://primer-spb.ru/files/files/sasonevajajebekulox.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/rokanulugubit.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135e729b19f4---70744827686.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/pagajubagew.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/72ba1b14636864080809ceea17ac990b/55718774234.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/donomiwonalaxew.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/wabobotat.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/batumowuvelubed.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/nuxanarejanebudanoxeke.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/77867465533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=payday+crime+war+androidPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED15 10420 bytes
SHA-256: fb1c1274ced62b73b286ad2fdbe34327eef3e83ee4a970ef8747281fe2be5413
font_02_sfnt_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
font_03_sfnt_off00011a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8F 23468 bytes
SHA-256: 3991bd1f2efb3340bc270416252b4cd2290caf6149da40db57ff5361bfb1e0eb
font_04_sfnt_off00015592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15592 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c

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