Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f5efa461173223…

MALICIOUS

PDF

82.8 KB Created: 2021-09-12 02:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 90b8b320f9b9ddd24d254dee24dd7bdd SHA-1: 05dff49a68badf7846797e34183f896e09a9fb8b SHA-256: 58f5efa461173223b0b2a98f65d9f3b6531e2082608deb6ca81d3ab2226fcf1c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://hamyarsanatco.com/ckfinder/userfiles/files/mavedebajijulufeludeded.pdf In PDF document text
    • https://dm288.rs/slicice/file/57262162194.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/pagevuzitasaxowe.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/55884880158.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/17764169516.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/tupivesidivosemi.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/zenajobu.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/ledezupalafona.pdfIn PDF document text
    • https://ptogel1.com/contents/files/49212911805.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/11914924389.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/37363731736.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/8956fecac0d9830bdde559e46a007891/24605755133.pdfIn PDF document text
    • https://avela.md/userfiles/file/rupusezajuxilotozekojo.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/laxuxaragov.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/58798697180.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/chdefl1ap07ofk26u4uln07l40/21329362824.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/43128046310.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/puxanepopabunowerejutiju.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1630555395.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/34689702231.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/55165249315.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/mefugowotijar.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/kunuzosibukumun.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc61aa366f---7718343792.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210902011146.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/salobip.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/lasapud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+transfer+contacts+from+phone+with+broken+screenPDF 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_off0000dd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3B 18148 bytes
SHA-256: f90c84649dab97a5d039d780daa49ab0bf32e1f6dd84f21d72017134f196eb9b
font_01_sfnt_off00010bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12408 11008 bytes
SHA-256: 892177f8d1c7d9e37521ce4152104cf37576a537fc30320e1bea89bee216af4d

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