Malicious PDF — malware analysis report

Static analysis result for SHA-256 88fa2ecf6611003f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-01 04:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 831f4dc33e186ee79fbd6171385d37d1 SHA-1: 5b90fded7d5d9cd264da068e8ba4e9f5ee086551 SHA-256: 88fa2ecf6611003f4bb54608c8da1169db1fa2e40721abfe456b24808c13d1c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common tactic of using documents as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/fbbefbbaee7915cfb041c0622a979357/4838561093.pdf In PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/tc136g3dddghsq54p8lse26nk6/zisivenekulegabeseva.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16092665173642---67623333987.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/bevalibativujoju.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/zewibikowosefu.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/sidavobedizudapadale.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/6r52l6s859bg5ecs84mmrh4ft3/jolivalage.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b75cda2f3---daguzotugomebuxilogeb.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25976391541.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/24604876476.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160789acee5bb3---lonaxelexalox.pdfIn PDF document text
    • https://maviet.vn/upload/files/72489113925.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/rerurovetuko.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be6b8c16903---junusafepofusumimepul.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7927ed15d6---80611771644.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/vijewukunufosojatula.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/1382tupjo5ke9q2jgc7s5t1f38/26610439263.pdfIn PDF document text
    • http://altinay-law.com/images/file/kufebowadujinekabo.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e3c714b2654d630dca0a54079d2a82b6/misuvimabepafoz.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/23407026101.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/20464499994.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/103784232609457bdc7486.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/50830264946.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/zijujilufakedofabez.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/34025566021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=obs+stream+to+rtmpPDF 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_off0000dc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC39 10336 bytes
SHA-256: bda61f36e42d6f4dff0a330d74f2dbd21dc60df631f3dc51e777f8d1ab0e3388
font_01_sfnt_off0000f36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 16684 bytes
SHA-256: c77d243b262b624f40e393fb8ba7ddce16c3f493d67757b5ddc62c6bcd63f7f7
font_02_sfnt_off00011e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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