Malicious PDF — malware analysis report

Static analysis result for SHA-256 648a0c8de3bb65b3…

MALICIOUS

PDF

92.8 KB Created: 2021-08-03 07:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4fecc38600912eeb98cbd0c2725d0bc SHA-1: 2f6d2b530430a75e95c3b593f47bcd7f44f9c25c SHA-256: 648a0c8de3bb65b352ec3a29f86bf42f9c227b10e8c690c6600cd2c5998a9ec5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a link farm and impersonates document signing services like DocuSign. Multiple URLs were extracted, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself likely contains embedded links designed to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • 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://archism.ru/uplcv?utm_term=outlook+web+app+signature+setup PDF link annotation
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/2s802j9bhf47bb6asqt8dapc91/lefosowasuniwidej.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/riwasalemezajupivitu.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b04a5fcbdb0f2f6e2246ee2e567cc72d/21912549659.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3555e78909---nalafutowukek.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/6cf4f06fbf07c5a20c057190d9bd5ef4/17960704590.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/23880211475.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160882b254a2a9---fomafa.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d2435fa9a---81861944056.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/34277244816.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef767f3655---80225294402.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/023f5ba64a747364ea13b8452118be44/29381104565.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/gan9tmo4253icd4i37c5th56j2/86953838328.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/3146186491.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/ea1d45fc7d4990235972b0fc1cba75a7/bekud.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/92669940705.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/da1691a3079b2664020063c600c7d036/tofapisuxojubemorasiwufax.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/57280604562.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/41506890750.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b88a1452513---vupowalojopuwefofutal.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/tuvakidakojo.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/54e19e927c2c685e60f79de6e3848ec3/61554005491.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf58ddef6b---48312130550.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_off00010628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10628 17304 bytes
SHA-256: fe999c448c990a424803dc1dfac0d785d2e5a3082c8f50691eae1a921fb814de
font_01_sfnt_off0001334e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334E 10872 bytes
SHA-256: c5750ffe1b7fc65a9c1cb1289946fb6f3f29e1b9ad002900196a6c062515d703
font_02_sfnt_off00014c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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