Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e0c92b8bd49b76…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 19:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 576c27e132a23e10a2e18328279227b1 SHA-1: 538bfcb03fbfb7390e9fdc92e1e578baab00e364 SHA-256: 15e0c92b8bd49b7623c75b5822307ae7252cec75ccad999d4f4f85793ad0e2e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various external URLs, some hosted on compromised CMS uploads and disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://markmont.eu/editor_uploads/system/files/19124207636.pdf In PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9964257279---3218780834.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/5fc705f0aa8075e23c8f2c182a4ec68c/wigodivi.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/hieu3amimv7cevgkmosc7rnh9h/zodepibodikijedoduf.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/jekepejenomova.pdfIn PDF document text
    • https://zzwgjx.com/d/files/rirerus.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/39979713681.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/87203892499.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/pvg7b6e5sihss3uiaf297cqip7/15994615906.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e07884fd1---837513426.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/6340412732.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/84595449823.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/90587996924.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/53216121927.pdfIn PDF document text
    • https://yodobashi-church.com/62464760051.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/79771289719.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/28927784405.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16091feb715fe8---lipejane.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160723a9ceb4f6---24728462339.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/lodawu.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/87807331779.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/bibeviparu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=proportional+relationship+worksheets+7th+gradePDF 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_off0000dd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD90 10900 bytes
SHA-256: ca53379afae765cca0e8bb62f89caf64d6a3029972dd636d568ace93712fbf8f
font_01_sfnt_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB4 18024 bytes
SHA-256: ed0fee9fd7f6664e55e042d37c29bc1efee0c52bc22fec8ded75f35bcee1d375

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