Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd28dfb502fc20b…

MALICIOUS

PDF

84.1 KB Created: 2021-09-06 01:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: d2c7706c9b6f2959abe82653945a543a SHA-1: eed79ec019888e4bf5c25a617acde5f072048d2e SHA-256: fdd28dfb502fc20b943de0c528fd03198872f2b7c0f78a4fd623c6b8f614adb8
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. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not directly indicate a specific family, hence 'unknown family'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986a9a83f5a---52823129082.pdf In PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/8e9d7dd62d59230a014c4c94e25cb7bc/navejisonazawujatuxiviza.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/36161575965.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/bewopujokasiwukidilifutu.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/98134927454.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/66123162598.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/63114767216.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a2e89a96ad6ca6e7b49d505223553e1/mefabigokogagetivekavu.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210602155412.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086c47b6a8e5---bapigafedopikat.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/86893302977.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/18196245724.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/31953200970.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/71101729418.pdfIn PDF document text
    • http://www.asslar.de/downloads/814309139.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/30441311844.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b356889f569---80507980361.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/cf3pm6r0e7prn0cjko3101u1g5/ferakafomuvusarezoxibulud.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/qdelufefva3f42bdaj1l9k9v01/jewadosuvuzazikipuxebax.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5201e4a85c---tasoxifitesoxukek.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efe22540a1---2564486077.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///37877147088.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/tevunagolabo.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608909336c7e5---supatojum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=liczba+mnoga+rzeczownik%C3%B3w+angielski+%C4%87wiczenia+dla+dzieci+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_off0000de26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE26 11476 bytes
SHA-256: a620fb8d57b98acfb788a849b08c36069d576c1a2e74cc8cb24b3312ff36ede7
font_01_sfnt_off0000f86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11080 18532 bytes
SHA-256: cd1a454691499738a34a25a1001860b733e914a5378eede9c9688351114fa8b1

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