Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a062eb8a7f6e7d…

MALICIOUS

PDF

106.9 KB Created: 2021-07-12 17:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 08a7fed5136506d90e49cb4f9cbb1ecf SHA-1: e3ceb613a9c94fef2f4de6adb8c6e63d0be70446 SHA-256: c4a062eb8a7f6e7d8bcfaf94298acd826a1e910a4975d7406d6e41bef637a6dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is unreadable binary data, indicating the malicious content is likely embedded in the PDF structure itself rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8f3cca97a---zojolejivevitibe.pdf In PDF document text
    • http://handbook.hu/upload/page/file/gudodelazijudex.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/478985e6558aecd803d768535d439d2c/japesegu.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/f185b5d37288a8cd67415f1a23d0862b/nivatisufawisamu.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b579ded95c---dutikus.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/fejineger.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ae4212047801ef3e5405b20799a139d7/95559248089.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f27742b5c0---tixugozimalizededulagunag.pdfIn PDF document text
    • https://datajournonepal.org/files/52860108041.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090afe454f12---wedogoduvenoxoze.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160972c3e68384---rulojof.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/dcf67874d905f69d718225e1fe214505/gowebemetefemefadug.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf4c49970b---womaxakokorilelu.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vijerozepavekijufibu.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a32ca0c83ba---vazegutavelo.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/wubefiriku.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d894a81a08---44375781617.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/39035e1f573a146c05d742fe5f2823d5/ribevikiduboguz.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/1042e0c5805114f0ff1457581cee4807/dixomulokosuserokumivoke.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/71983097932.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1403432f3b---45054373241.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/badelolemogogiratab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=effects+of+employee+empowerment+on+organizational+performancePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8d036f9de4d00be66d3dba9c95c4ea75/wujunizunuwununezaloka.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_off00013db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB1 17112 bytes
SHA-256: 18c215384169be91c0d6168fef9febfae6ad845fda9083024714ac4f338197e2
font_01_sfnt_off000169db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000181f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181F2 11068 bytes
SHA-256: 8b4cb3d6886a0f023d6515c3c2f72a37246644825bcb61ec5f13a2f204b6a8c1

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