Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d538ee3fc4924c8…

MALICIOUS

PDF

79.1 KB Created: 2021-09-05 09:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 566bc878a5f03e10c784f11394f80f08 SHA-1: 564d4ede6edba233ea1032751d3b7b63047aa846 SHA-256: 1d538ee3fc4924c8f17c2b6e109f946d2f8ee31ea727d0fdf4d1a36e3b911acc
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. This suggests the document is designed to act as a link farm, potentially leading users to phishing sites or malware downloads. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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 http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607d68eaa2124---reledikodag.pdf In PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f03400a1f3f---bubagowiwura.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/70834083162.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/bewiliz.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c9cc88430---70994310352.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16104b3f44a7b9---petarezonir.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/a1994b87e497bc41467fd289d0b43526/sududatapegasaz.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210518105354.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/88399960996.pdfIn PDF document text
    • http://snsi.jp/image/news_file/19739216134.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/366f3f8dedea1a5c3948d9b4fb3f47ed/magawokan.pdfIn PDF document text
    • https://music-group-store.com/upload/files/xuwujovalatiwazupajuxi.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/42823780550.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/mafafugavutojure.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/82b38fde9fd5c064df7231beef7f1ebc/45936640983.pdfIn PDF document text
    • http://industrialdevices.in/uploads/tefabifulinakaxomata.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01ea948275---35207257682.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/97603462638.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6c029d867---sovelababejesonox.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/buduxibomukoduvogubowovub.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/minal.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/29927198496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=descargar+schaum+circuitos+electricos+pdf+gratisPDF 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_off0000ca5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26C 19736 bytes
SHA-256: 85c1f8467d4a346f5c3541fee7e8cbd566dccd31b85113779072cbfbbc592385
font_02_sfnt_off000114ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CE 11064 bytes
SHA-256: 7bb58d3fdbb73e2046d5f15e807cf674463a93adf6fc94a746892d05430a799b

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