Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2daae8911a51922…

MALICIOUS

PDF

73.3 KB Created: 2021-08-27 23:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3743da181f50037ec03ab3739b003b60 SHA-1: 1e5f0bed5f8b948576f1489f1e698bd2bdff5c62 SHA-256: d2daae8911a519222663dafb7a3c2b6739490d6d6dcf1729c7da9ef55d157436
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The presence of numerous links, some with UTM parameters, suggests an attempt to manipulate search engine rankings or redirect users to malicious content, consistent with phishing or SEO spam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://alteanetworks.fr/img/file/16158218443.pdf In PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/88367862156.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/bukobobozowazarobo.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/67166011367.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/55291458047.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/fiob8t24suugi5p01v9jrc9pkm/milogifinawezi.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff02de3e2d---47755075568.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/fobufojeloporir.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cceda463ba---pagowup.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/bujeratowukufobaje.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/52fd6692e1d9b7357e70420f8e8ca0d9/27591567676.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/0b3c928db8de1388b4d2cc4236e07f93/50139511048.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/5c346a059deae26f015e8f15d97eee33/finuxuboki.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/3tf0s927njbnvl3np6ksv39eam/lewasugiwubiw.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083842aa1c15---wunuvu.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/10823d05f5b93d9149e7c617c07c6988/29169644423.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/605b4a2f56b96bc43083f6c654dda493/manuwezolitad.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0334987001627122849.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/xanukezez.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161011715643c9---gewibirazaso.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/a1e30bdf683af3c9ba488cae3769cdf6/mavonerirojob.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160c50109c5a99---5448945351.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8559fa82f42048622b31caec270b910/relifunumewomapaxegemuje.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/81d0949531b4a4445e6cfcd9f9b59d13/putasagibepadisilil.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/xovinekegaladow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=gaming+store+near+mePDF 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_off0000c01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01D 10444 bytes
SHA-256: cd8f7aeac7a9a6f3c75d0f9510dfa8b0123fd776ae73701b6b694f50d5eb4ad5
font_01_sfnt_off0000d7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 15592 bytes
SHA-256: b105438ad52ea54620081432e08d2b5467051bb5d74c9dbd988c2b4dda690f81