Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bfe0845933f68e9…

MALICIOUS

PDF

88.6 KB Created: 2021-09-07 13:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 111d2e3c0d0e06d871c3c49cc53b6466 SHA-1: 0112607e3e5e08812567fd78ce66247a78fb2153 SHA-256: 3bfe0845933f68e9cd5e053a48bc98f47dba6b56fc365c65d6026d9c1bfbbd89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/vrdvrt8b0fuvkoeusadt4oc4l3/vixewarasavetogibonimofo.pdf In PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdb6d638d7---74709081443.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff2656a54---93313541341.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/89941045461.pdfIn PDF document text
    • https://inncredel.com/uploads/72023155113.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/4e6a204072aaa8608b542586f94a1454/16963992609.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/00c7b518779e2a0c4ed6a9f1474e0c31/18423601127.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161122f9c020e7---tabaxelepawadalerupike.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/bizixiwowogajopabebibebe.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/28147297917.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/7b571fa8767ac707de668f69bc2bde9b/31003331670.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/37135785473.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e725a0224---31574275593.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/subopakitewerosuri.pdfIn PDF document text
    • http://george-dollie-nelson-mass-reunion.com/clients/3/33/33de80a6744892f7217a81a137582dad/File/45178337017.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/kiq6a6qdakbs594fjrj0uia2a6/nazowanoserarosap.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/zanazoriruxuligiri.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df97dae87a---bikobijufosano.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac40be03ab1---46592558230.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/6141175010.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/nazutexomasaparijimix.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bc053668c01---waruramazuj.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160e2770ce259f---4867356542.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021081822351373499.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/kevimidumenogupinapol.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/36008003289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=consumer+buying+decision+making+process+pdfPDF link annotation
    • 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_off0000ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B6 11296 bytes
SHA-256: d863c09503518f446c55e10a4d3f2090dfd50eaea70e88fc60b122af828d81dd
font_02_sfnt_off000121df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DF 19580 bytes
SHA-256: 2405e18d484fa90f2abe6321dea666a6a150b0d64a2df3056f8ab24a7adf1ba2

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