Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa0fd35bc0731594…

MALICIOUS

PDF

89.0 KB Created: 2021-07-08 12:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 473799ef1c168756615953a696a1fd9b SHA-1: 2ed4a4edf2f51abf2790e85850fb5e41b406caec SHA-256: fa0fd35bc0731594b788f0c6e4c122338a0fbd951935e4c026ba1f544546b797
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the PDF contains a link farm pointing to compromised WordPress sites and other disposable hosting, with one URL specifically mentioning 'windows 10 iso file download 2021', suggesting a phishing lure. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=windows+10+iso+file+download+2021 PDF link annotation
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4c1693171f807db57990cc76d35188a2/88233959438.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/laxomubobotomalikiwixebu.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/zosopuzebusapokopasi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3cd75d540---31369363929.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/fa70e608eaf99df118a262c6703f71c7/81092346545.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/widejologubijab.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d58de36f3c981a9a447aa1453434bc12/bekukujewegowiname.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609228f2b8316---vofalibemobadelifox.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/b928becb1f9b5ee1bc8ba847015dbb94/45358661325.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10720941670.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/32654807099.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608beec43cac1---tedubiluda.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/ec9fb3923d1f7ea1570b0d6c8ae72e3c/59994407112.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/d5a57e4c0df60539d95844aeb64e8a7d/notuzefubivaniluw.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876dce750db---japewuluva.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/rajojofenupavusewe.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c5cc7a9559b1a25401b7c40717e5c34b/sesiralirun.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/vimipisosomalerixug.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f0e630503---xowakotiditomusise.pdfIn PDF document text
    • https://stvorki.ru/files/file/59442903080.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/83d60507b1d5b416ecda151d6afc2b9a/gixajamerovuwugibututopu.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/12271592500.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/3d25b55d8e303d4b60857e98156b75d9/14882807398.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/1310772152.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_off0000fa88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA88 16892 bytes
SHA-256: 5832395c00208da8551889676906e846d6388765e1b2d6d03f80de82b97d3d57
font_01_sfnt_off00012636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4D 10524 bytes
SHA-256: e0398179358526c852a7c1b374a42f1d7cba4368f41f8e4520c97daec2fbca3b

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