Malicious PDF — malware analysis report

Static analysis result for SHA-256 67baac3b895e44bb…

MALICIOUS

PDF

89.4 KB Created: 2021-09-04 18:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0e536e4be6c4e4c47736b93589238be9 SHA-1: 192c7c534406afc35865f0db610c6a587f3c1c38 SHA-256: 67baac3b895e44bb5ba346f9ce9dc1e3b8199e5a3c28e698216cc70f56fa2282
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised CMS upload storage or disposable hosting. These links likely serve as redirects to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9729

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://bucatariizidite.ro/printuri-fi/files/pigijokibewodogexid.pdf In PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/rakerumowasuzu.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38e638875c---93618325623.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161266f40b2232---xawesononasokaxidotu.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a94a47b5a5---gijufegotalitaroxedoxevu.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609548c9dec0a---51740836352.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/jaxup.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/d174336e3b3add9a52450741628bcefd/welazowudoroxoxomudetefe.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210701063518.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/najuzupetel.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d46e786b411---xurenuxusorenewuwo.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e34d7f784b9---bumibezabifi.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/jujufuxoxi.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/c2o66pil7ccr0e1i3h54j21966/sexibom.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adbc476ec5---xevejim.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/7165736e104f24ddfa36541c678bd76c/71133986847.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16102c10d3eafb---kizedebanalapozibanotejik.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/xezinisavudumubakuwipe.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021072409444995.pdfIn PDF document text
    • http://findacommodity.com/upload/file/60008453687.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b7dc3e635---ruxoxosukunomiremezado.pdfIn PDF document text
    • http://megalaserasia.com/upload///sumujitegokajawoxemag.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/87178361309.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/17732821415.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/30586888641.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/tirifara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=manuale+d%27amore+3+trailer+itaPDF 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_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 21144 bytes
SHA-256: 72e647747dce80d7f556e0d4b1551ce656325fd4f5b3add9dee1a1ae221cc7bf
font_01_sfnt_off0001266c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E83 10540 bytes
SHA-256: 081f0710bb8ac2ebae5c6561ddabbc3648a98b39d103244330a765623c175ef0

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