Malicious PDF — malware analysis report

Static analysis result for SHA-256 2795abec9579c0f0…

MALICIOUS

PDF

76.0 KB Created: 2021-07-08 00:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83dea3b280f76f2c9117017fc8847ea5 SHA-1: b35cce592c4eea1e4b326e7b6ba9c65f5b810f6c SHA-256: 2795abec9579c0f0422cf5098359498ec4c453e90ba01e3362aa16ae5b953f21
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://nomylo.ru/uplcv?utm_term=how+many+mg+in+one+mcg
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b326f403c2---boxodataxamudekolisuj.pdf
    • http://uleshuzatshop.hu/files/file/51783624400.pdf
    • http://driver-jazda.pl/upload/file/84639603999.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f3bb9bed9---vededa.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/90101474834.pdf
    • http://grawerlik.pl/userfiles/file/99245922873.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d81eec41a06---xikomituvilobagonunisumo.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/61bd47c22fa9bc2097317adae14269cc/mepakilojoweli.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/7n10a7e0pmt4b005003dgpjrh6/manugedu.pdf
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/31137550730.pdf
    • http://alliance-ltd.com/userfiles/mozuwiboj.pdf
    • http://hayatteknoloji.com/webimage/file/64148640844.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/71aeb570430a5ad7fec97e8c54d24622/tasebowabexexitegurewaxuw.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160984a18daf1d---suvexewofepetosivananaso.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094786b44692---72250511250.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075b7f125613---bedojudud.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cafe7f02a---lutixorafa.pdf
    • https://secolink.sk/userfiles/file/dorifigabi.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d616549ab9a2ab758eedf3647298be35/85202537565.pdf
    • http://suttonoakfarms.com/clients/880813/File/rotijabivovokujuva.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/fv160hpsne71rmf3f3kd1t4dh3/resaguzawikiz.pdf
    • https://aduanaldelvalle.mx/userfiles/file/naneniwosopupizu.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/orvgvcd22hfu18j6aaf3af3mef/94607874790.pdf
    • https://oversaslogistica.it/file/kopenoliladixegu.pdf
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/94429220355.pdf
    • http://polyacer-ecp.com/userfiles/files/20210704_053702.pdf
    • http://martonaroniskola.net/userfiles/file/65053880358.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C1 16792 bytes
font_01_sfnt_off0000ded3.bin
4a049bb7b7ebb8afae68087227823446ec581073cf9a9b4fd516e988a7039bfc
pdf-font-stream PDF embedded font (sfnt) at offset 0xDED3 16480 bytes
font_02_sfnt_off00010989.bin
04e9dd9404ad3d38b578d986ba85a44427238ed09fee4e07bd22a76278cfe797
pdf-font-stream PDF embedded font (sfnt) at offset 0x10989 10352 bytes