Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78fd1b4b37e170a…

MALICIOUS

PDF

84.6 KB Created: 2021-07-02 14:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: cb1d758af124b9909955ea7cb7360a34 SHA-1: a6a2ad3fa51d8a123525a68d28c0e279cbcdb310 SHA-256: c78fd1b4b37e170ab38dcf18cd3aa61a761a5d304bc3fa65707eb8d663d3022f
96 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier and contains numerous embedded URLs. These URLs point to compromised WordPress sites, suggesting the PDF is used as a link farm to redirect users to potentially malicious content or phishing pages. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a coordinated effort to distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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://philabc.ru/uplcv?utm_term=bs+1192+naming+convention PDF link annotation
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607778cb9ae67---nanawijate.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898d530fda8---fiwizisifepojerala.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/82f699038ec0f95399119b6c62296662/totupakebegizogekijemepe.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b2265836c26---pudaloput.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/37367632523.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/4578f19b0248a151866b0023c122fddd/natodusujozirisiditabuwoj.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/99713312271.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/vusogudolixamagikizu.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/b9fd80a5168dfaa4079e6fa689b72564/vejozefirulezunamiwizu.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086b1ecb7610---75302056414.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/51762429604.pdfIn PDF document text
    • http://elitvorota.ru/f/file/taxijekej.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/9ad56074b4b790f0b90e06650c3f2be1/54472781386.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/wasedujinururezodilovir.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/wimoxawidejinumufuxumevo.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/091bbe3c96d9e8f9e991a9cfa63a4b24/sowomoxalukubifunu.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607112d03bb08---budamusuwolidirazavewuni.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1d44ee99a---59493983741.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f6a94bff1c36c676071aee39071eac71/7757998400.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb20b8d2f1---27541343565.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607feb55637ca---43615887825.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/87303263740.pdfIn PDF document text
    • 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_off0000e5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF5 17644 bytes
SHA-256: 8375f0dd977c5e7007a905c61d2f1aaa50ee6f9877dadff2b65c2bafd08f1325
font_02_sfnt_off00012c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C00 10884 bytes
SHA-256: b97d779901fbe22ad6966a35987186e625f7444d9a17213107f8efdd5b556d1c

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