Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9c12345640876d…

MALICIOUS

PDF

70.2 KB Created: 2021-09-06 00:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ceb932f67a74e02e5a0d983c7724fd5 SHA-1: 86ebe539ed8a9422a153727a9a39e11ef3f8c077 SHA-256: 7f9c12345640876d50d202719a1aeede23d39948a8f3c4337ea16fa5512a700f
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains that appear to be compromised or disposable, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness, and the presence of multiple PDF link farm heuristics reinforces this assessment. No scripts were extracted, but the primary attack pattern involves directing users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=mazda+demio+2008+service+manual PDF link annotation
    • http://aftckwt.com/uploads/file/42855003530.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/femukudimed.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cda42f22d---soxokanutevavi.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fe54488f2---gibadepapikuf.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jumezerujanatuxan.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e358e8ba0---45785673438.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/napalut.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/57437720493.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b02dcefb5f623dd3844d69fbe3f5b8ac/79310843884.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/buvivuvitiduwex.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/62717430298.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e51b1f454---97693733957.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/bimetin.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/nofurujefifilatuxomewul.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/kimuzerek.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/18234173482.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/287feeffb26a9ee160a18955a45c8238/tadaruxej.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/55825325218.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608997e0b148e---72519350402.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/tidozu.pdfIn PDF document text
    • https://razredna-nastava.net/files/29723926892.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/57666550601.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161293a7e40e5f---30194953482.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_off0000b15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15A 15664 bytes
SHA-256: 0d067f108921c1a8ec732f963e4e1541b3bdf8b11f2a309c7b73009dc99da575
font_01_sfnt_off0000d952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF169 11104 bytes
SHA-256: 8ff5b81110178ff64747999d0e02e79b2a70522af6b067b971158543a996dd8a