Malicious PDF — malware analysis report

Static analysis result for SHA-256 86fce77d013b05b4…

MALICIOUS

PDF

104.0 KB Created: 2021-09-12 23:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b7c11f83f5b526fd0eebc953268ba137 SHA-1: 7af5d535a3b57757f89d446765c2449842835b97 SHA-256: 86fce77d013b05b4b9998831aacb70500dd79558bc1692f9fdd22e0d242514a5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms, suggesting an attempt to obscure the final malicious destination. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb61ad64dc---vukozusabaluk.pdf In PDF document text
    • http://savytrading.com/userfiles/file/govonogetomaxijamadodanir.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/41323297006.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/zokunaxedusojuzi.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/rulawuridixamibukagaw.pdfIn PDF document text
    • http://sushi-belovo.ru/files/29787524211.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///35890179831.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161330e82f07f9---fikavulexim.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/gobujozufad.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ca02e889e---1564531982.pdfIn PDF document text
    • https://12shio2.com/contents/files/powekuvezamoraga.pdfIn PDF document text
    • http://iltorg.ru/upload/file/jusosisesifikela.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/dinuvixobaxige.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/vemapibuja.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/18866194541.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/caebe0c3c05cc5fd458590f223b1e212/95058600316.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/lobowananurazafo.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/81660233760.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/semiwisife.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/32696947348.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/vuzuzixorelasal.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/26678380237.pdfIn PDF document text
    • http://mobiliteit.nu/files/wawaxav.pdfIn PDF document text
    • https://phnews.ro/files/file/34654299620.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/bf0c41e28706461517c9f17bb594ed39/17114732274.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/14230993525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=kickin+it+from+zeroes+to+heroesPDF 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_off00012dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14611 20288 bytes
SHA-256: cddba7d8399eeeb3e5ee9faa17baa66a1b42d27a1dc20e5c58538d39d73361d0
font_02_sfnt_off00017aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AA3 10536 bytes
SHA-256: d9f0a225355284637e529d45e93e11d27c00a67fd20fc9981874568480dbb2c0

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