Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a58f1ce836c2e6…

MALICIOUS

PDF

114.4 KB Created: 2021-07-08 03:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b19051e6f882d3c72f528c156fe1d951 SHA-1: 8609bc2f7e265d4fe9b26ba955d737e976aa7c55 SHA-256: 54a58f1ce836c2e65d1d366a3d926e5d851e9badce63ea7c4edee4f477226b62
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting sites and compromised WordPress uploads, a common tactic for distributing malware. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pistant.ru/uplcv?utm_term=girls+that+start+with+s PDF link annotation
    • http://nickels.design/ckfinder/userfiles/files/lulikalalenizowovafilene.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/raf90i6auc9mb83b5stboo1shk/73620277178.pdfIn PDF document text
    • https://cooperspick.com/files/27557034458.pdfIn PDF document text
    • http://lawngo.net/fckfiles/revuxex.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/el744ocal795nruiqk9mnakto2/5341554717.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/livudem.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/81181394312.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c31212db2dfb88623e389567f2efeb16/34845924119.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/m95pts9knp1v84m5an0af2jccn/rirudimakodoniso.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/6350vtsj047e4tvlec0rdp8aan/tulozonunakiwusafiwu.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/0070c5eab614178aee69af07d94bca33/vowaxedenudigavuliwed.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b4e553184e871d0435657d5101f6d8ea/rofupegiz.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/jutuseganilezikigu.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/63267513746.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8da5246ca---pewewubiwirewulexe.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/juwurekirefajixubovabafuf.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609cde4140ea9---55867711229.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/xenovapolifagipurif.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a034e170309---4734428878.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ripvhjoqiqi9hmb8os8dnpplqe/6371805322.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/26870385567.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097894f1a86b---31336012673.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/59738257310.pdfPDF link annotation
    • http://chrisdepanneservices.fr/Sites/cds/files/zoxinomovurisobavive.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8c0077b1c---40272686601.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/b50ce6c4d197313499e8113c09516de5/628515062.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_off00015b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B1E 18908 bytes
SHA-256: e31ce02247d2eb0a3341c0b31978a2228b5df0f12974d5de5b523847c33f5f78
font_01_sfnt_off00018c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C69 9972 bytes
SHA-256: 0d3291d944b86a1b7d4ca52070ddce4476e8ac25b252086fba622fd2a4a3b7ea
font_02_sfnt_off0001a2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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