Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7ea10108a5e37f…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 01:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 24cf1714ad39955906e5cc8f2950dbd3 SHA-1: c6e79b443b9f5698a0b0b4cd2924263d0b335922 SHA-256: ea7ea10108a5e37f4749cc09cf78a28046ecb7a3a8de4135307e403b5cc7012f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous other PDF files hosted on compromised websites. Heuristics indicate these are likely part of a phishing or malware distribution scheme, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged it as malicious. The primary attack pattern involves luring users to click on links that lead to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://newoptic.mn/uploads/files/bavatajatuv.pdf In PDF document text
    • http://mishor-uvk.com/uploads/files/vepinopaduko.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/50f01d5e47aa369f19bf73b45609cc38/lojuwupijapiwebe.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161296c14b9df5---duridusunaxoledunuwonamep.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/51582403278.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/976a2eb8d500fad297b1dd24074b04ef/dasiv.pdfIn PDF document text
    • https://ms01bet.net/contents/files/10578787596.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0362476cbf265d3bb2a389c3e398b975/18217466650.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853973597e2---sosizatefuxojovebevu.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/5b1b63ceec31d4464d54347b3ef2877e/73732202636.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a31a90982ef---10199494696.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/56195659101.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/7330181220.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/fuwifixunofaluduvowep.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/18964703417.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/tawozeko.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/48049345943.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/2d6olrij3rrjdl6k3l9mget1ai/kovulixox.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///43764859162.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/jomivikupo.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a829c3dbc1b---mibakezurofigatotumaz.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/22030071229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=moody+blues+sheet+music+pdfPDF 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_off0000d61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61B 10868 bytes
SHA-256: 04095c8e242739003746efc309abd5ddcec40ed2672faaa400c7db33294aa45d
font_01_sfnt_off0000ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 18012 bytes
SHA-256: 390108db00960068623c39693f5da7efe61360c05e0277433e93a2ea4bedda32
font_02_sfnt_off00011e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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