Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac4a371345a26e0…

MALICIOUS

PDF

75.0 KB Created: 2021-07-01 14:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 875b8f4da4ce1d09b5d5310beb40e42c SHA-1: ef5279d7fe36e2c8e4e28428a29c87909e14c5f5 SHA-256: 2ac4a371345a26e00b4034db57fb5a0bc5c42635bc281827445f80dc5c509a6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=arsenic+in+wheat
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d60e0e85b4b---pijopinemerolegivawoz.pdf
    • https://ksboutlet.com/file/files/rikavobunal.pdf
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/92808690017.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/8jl66i98t74f9rphbjkg6u3pe7/naxilimogofim.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc190da877---risepojeritefinisubo.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3c989748e009c748af71fe0c1f3729af/xaboju.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/fecd1f06e798ef65ce4b52f0d0a3cb48/10040428870.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea4a6bb331---jadiwixumabofofudi.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cde47eaa89---tinizogozejijegu.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce43a00239e---60045123440.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/5341805502e27ca034a6e1d5b5374e56/zovurixakuxilejabe.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7eb870b4e---23948850703.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/23258203717.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160778f2b8f16f---pukorosa.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/dde3c7bf47039df5547457f88527567e/nenobuvigobuwotobize.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608183d9073e8---fiwop.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/518fa82dbc4aa3a821f3ecf45f1178ad/razemil.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/44b42bac46fbc2eab24de5a8528c181f/sewiguxaxovewusaru.pdf
    • http://bidmitt.com/img/files/file/sakigipepuj.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b24a350330---35822400844.pdf
    • http://alrabbancapital.com/file/files/fokukukelebanuruwam.pdf
    • https://adian.eus/files/galeria/files/35222734270.pdf
    • https://kidneystonetreatment.in/userfiles/files/83665985857.pdf
    • http://ilovechardonnayhills.com/userimages/83703070324.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c57c.bin
e1a76a7f4f434f14d68a851275a131847ada7a9650793eb85f05c2af869cbef4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC57C 15864 bytes
font_01_sfnt_off0000ee62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 16792 bytes
font_02_sfnt_off00010679.bin
310f82fa298e21770ed26051bff4d0cd583ffeaac3b21e53dc494843e0364708		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10679 10228 bytes

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