Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a4205d0d04152f…

MALICIOUS

PDF

87.1 KB Created: 2021-08-08 02:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 32a0289f4ca9658a720f65be653a22f2 SHA-1: 896057f6e62d6631c2f1f44a69ff193fb395a068 SHA-256: 85a4205d0d04152fe5ee97530fb4ba25e3aea7a9ebe95e715ed7cc085ace352e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious content. The presence of 'utm_term' parameters suggests a phishing or scamming attempt, likely to trick users into visiting these sites for fake offers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nomylo.ru/uplcv?utm_term=how+to+get+a+free+roblox+gift+card PDF link annotation
    • http://saovietgroup.com/upload/FCK/file/3109038800.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ada48a27f38---ruzawilovil.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/5995ac379471aa4306d9a641606ad77e/bonubogo.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c676c1b3dbe---58930924284.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebb3609dd9---63751414766.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/419cc858ee4a212e1173bea98dc4cc45/96501693490.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/70496334465.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d773a4710---37621332186.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/73142481974.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4626071dcb---70358256435.pdfIn PDF document text
    • http://arslanemlak.come/file/gubilomipexexoxisi.pdfIn PDF document text
    • http://ecole.ru/text/images/file/vasalikefamudanu.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/79508954023.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609835c1191ef---wosedarapipigetebuvo.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/gerikubapuxopiwal.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/58258823403.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/8933822441.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608729cabd788---wonenujazusuperelax.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/08975f76593ec78d13f82f2da4f2f264/99723867686.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/4aeeac96788663b322e98d4b12c3e0b0/31635479099.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/buvevo.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/tegemarabenununivi.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_off0000f018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 10696 bytes
SHA-256: 09fe3a7438f510b43ce20561789be35e1ab9b81111c8d33c75caaea3b9729fd5
font_01_sfnt_off0001089b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AD 17444 bytes
SHA-256: 5e6d113d6afe2992e0cea66c5c308af50b523c89c396a042b95390f35cc9f509

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