Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6b90a38f45f562…

MALICIOUS

PDF

168.0 KB Created: 2021-07-13 17:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5016d3ab8823fe9b23eb2d4e4f70514 SHA-1: 98bf279809823959938db9be9c79f16d59f00307 SHA-256: 4c6b90a38f45f5625786081e62c21f0fb05ea1952f9845897af4269c45b1e01b
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document that employs an advance-fee scam lure, attempting to trick users into believing they have won a lottery or are expecting a parcel. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://www.siphonicflowmandiri.com/upload/files/68078123869.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/19jd70vficlk1bn9j5g42ven97/mobobuwuvutabu.pdf
    • https://fenixfalt.com/userfiles/file/23467899390.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dad7b1bb65---88469118681.pdf
    • https://semut73.com/contents//files/gogironagisas.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/4c2d4a202dee6c26954572e6977f2055/16124843974.pdf
    • http://aranykoronakft.hu/userfiles/file/fejufanobiges.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160855d3cc9900---kalumoxadomisako.pdf
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/53693161191.pdf
    • http://kolaykanal.com/userfiles/files/27388525563.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/4t48lmfkenoe8fpd9ni3p13du8/32644441278.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d406932969---7679926411.pdf
    • http://crmrealty360degree.in/userfiles/file/98807558773.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/414fd1454845837e8ed34ae8e20bda67/61016865178.pdf
    • http://liddellgaryfamily.com/clients/863293/File/lenexu.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071da08e1d8e---64256901007.pdf
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/dawodigapepi.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/d7023bff861cb01915e15cf0a83a75a7/merutilefujusiziviwixatem.pdf
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/96069313273.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/87ec1a81f5730f936507323eab84f4fc/tosenatejap.pdf
    • http://bertoniamministrazione.it/bertoni/public/file/34598365116.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=dnc+nomination+roll+call
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000219a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x219A6 16792 bytes
font_01_sfnt_off000231bd.bin
9902290dafebf13f5fc1097588d4d01e9065ccab6f349e74b0f644f2733780b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x231BD 10092 bytes
font_02_sfnt_off00024825.bin
3b4f0f053d2f620a1aa902dd8bcd61c0e923d9b3fd8e8a9055b2dd6020055f7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x24825 19332 bytes
font_03_sfnt_off00027ae7.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
pdf-font-stream PDF embedded font (sfnt) at offset 0x27AE7 16140 bytes