Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f78bcb1789cc91d…

MALICIOUS

PDF

73.2 KB Created: 2021-09-05 22:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 813f3870987fc8dd859e075a369f08d4 SHA-1: 03cd7157ce0aa1f17e49fbb30eaa178d624cb037 SHA-256: 8f78bcb1789cc91d6b15d9697b8099de04a984e797b0ca572eb88128dc6ca0ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress upload directories. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610df7cf5ac20---vivajasixewelibag.pdf In PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080db6e62b2f---19661483049.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/zupukawagimajosuwabi.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/504fbe131908c9ecd249bd577bcfe927/litewevo.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/e202aba7b09213a75f0e0373e7ea233a/jovubuwiguxosigobeb.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160928b024449c---59731587285.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/5085035601.pdfIn PDF document text
    • http://indexone.ru/upload/file/kibokizanobar.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/mugenotevufexili.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/40060026096.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7af089b9f---nudufix.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afbf62337e---gavopelapol.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/suvelovakubuvowipux.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/92498187357.pdfIn PDF document text
    • http://proxima-design.cz/files/file/79083418716.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/jivuwagotoj.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/2affede03044d492546bd96a808d7419/kolivarozemulupotiruj.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/34990780531.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec62431a3a---nowakogajofuxejujunafike.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c91095f6e---pufuzukikiw.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/87414863141.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/90729320088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=vibco+scr-100+manualPDF 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_off0000bac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D5 17080 bytes
SHA-256: 0607772fc4aadd22f8fe305019f01e9355aa6e82579d56f8555ee19bca0fc480
font_02_sfnt_off0000ff70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF70 10576 bytes
SHA-256: e0d0e2060d07eb841feac65db0c7805aef4ea0f20dbeb94b759e5371fb104cba

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