Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8c43138b20ded4…

MALICIOUS

PDF

77.6 KB Created: 2021-08-30 18:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c946f0cf41c0a2dedc1045b29b254a07 SHA-1: c8a1f33d20bf8efebf9b65ef26ea2c20f9c59e02 SHA-256: 3c8c43138b20ded4fc7be93af43cca2f0d561fdf42e3e662da676e5558fb1925
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://catamma.ru/uplcv?utm_term=dwg+to+svg+converter+free+download PDF link annotation
    • http://ultraljud.nu/bild/files/tosetiduxaxapovojugowi.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/mosenogew.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/595c054f0019f8de310e70722bbb890c/65776069462.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/45187526872.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/94387567076.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/rodafifubu.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/25971803975.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c204210c56d---53986681786.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/lanofoguvimejaba.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210801_AE794651196E06A0.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608518dc95172---jezoxa.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/bodipezi.pdfIn PDF document text
    • https://go2germany.ru/files/file/31519476358.pdfIn PDF document text
    • http://ridendo.cz/files/file/22012415359.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2d811de310c35e53196eed67d8bee898/tapagamuximobimataxujetu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080f7eb8855e---zobusudiv.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f0b35ce07---60957464100.pdfIn PDF document text
    • https://austarpharma.com/upload/files/37055235079.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/sobuxaxuzekoborugolafus.pdfIn PDF document text
    • http://www.celso.org/download/75198974233.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/6435610567.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/19lpgf7oncb1d4k1cn8njpphbv/fidavaxifobuzozezulozafab.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/c67cd54d6ee2534c5ef6624789b819b2/78385344052.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/si61r74vp3buggdfbi598g3r95/79042210594.pdfIn PDF document text
    • 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_off0000c1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D2 10712 bytes
SHA-256: a53e03de84e9efe54f26ed75ee1cb08e54002e556e863c622e01b5a944506eea
font_01_sfnt_off0000da70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 19876 bytes
SHA-256: 6a28b2003866968d144d4ee31b9f16395d9a95707cad0e489c69e52db1792bac
font_02_sfnt_off00010ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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