Malicious PDF — malware analysis report

Static analysis result for SHA-256 2baa05637fbfccf9…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 03:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a11c0048d34997f410c1dc09cbd0d95 SHA-1: c460e209df7a5b424adf931717926eaa8239fd19 SHA-256: 2baa05637fbfccf98bc82cf46b023f10ba6db540da33e81695a97e5766ce34b9
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. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised websites or disposable hosting. The document body is unreadable, but the presence of numerous embedded URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://camberwelltaxi.com/survey/userfiles/files/37787587474.pdf In PDF document text
    • http://montex.pro/uploads/userfiles/file/sowuwoviju.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/4848057988.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/revumarojinuxoxu.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/06ff86203ab35014cc4c2ce528be65e2/sosodozegininipiwi.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/fuzaxuwalofuwovewaze.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/31818832012.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/59833217248.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/74105340054.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613738d94c0ea---matugufukutuzef.pdfIn PDF document text
    • https://gdaniec.com/upload/files/tusenepifawajobe.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/kurexafowof.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/bugiwevew.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/49046781260.pdfIn PDF document text
    • https://digicpictures.com/downloads/gasovidazixut.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/lemaxabafezatefujo.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/30459584529.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/2496369446.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/kejabavobuwogad.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/tiliwapomuwexigepi.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/jubifimaf.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/92288457561.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/melaki.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613172e966fc7---kilidapux.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/73025725112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=happy+mod+pixel+gun+3dPDF 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_off0000cdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB4 19020 bytes
SHA-256: 1c5bb014655b29b512a0f195651779a5ed14661d1a567d051d6128584aa6c8d0
font_01_sfnt_off0001001a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11831 10848 bytes
SHA-256: 634c8eae09913b909303c25ebbbcbc8a53fc0ff5a0ba67324ed672985a1dc6ee

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