Malicious PDF — malware analysis report

Static analysis result for SHA-256 f833309ae71013db…

MALICIOUS

PDF

96.6 KB Created: 2021-08-01 09:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 970ef60412283bcd5c09eb78ac9eb020 SHA-1: 65227ddff8fecb2df320277f1adb67fdb8e1e86d SHA-256: f833309ae71013dbeb269fa9b2d12d23be0f40f75ac7b230cdfb57a3a8ffd182
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing pages or further malicious content, aiming to deceive users. No scripts were extracted, but the presence of numerous external links and the nature of the heuristics strongly indicate a phishing or SEO-based malicious campaign.

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://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/0b85c44c4b4f0e2866cb1286b182d04a/bofigi.pdf In PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b8e35aa5b---37552301926.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/ac383dd36aad41cd8dc0d4746d1c462b/vomakapiwutakexepepuvome.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/5a981131ca5dad113d3077fc1fc3556e/25008590229.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/43606505949.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/75887367721.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/8af521944fca83c38ef635939a2ab26a/16634235782.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/satexesoki.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/bebuginobu.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/14438884884.pdfIn PDF document text
    • https://peterdegendt.be/file/gawafuvotabulebutojal.pdfIn PDF document text
    • http://splogservice.ru/content/file/32482191550.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/kemevediwabuwana.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/60559861758.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc37c81c2f---55269367893.pdfIn PDF document text
    • http://tms-operation.com/upload/files/34158260470.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/lejakiged.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/36387643129.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/lovesutijifuvuraziw.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/fitilu.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728f0c2615e---jamorofikamigubudinaw.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/butesoruletenolanututulix.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210706051141.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/nijivetamejegedevu.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/75ceffd7a709d7b7866d87bd57d851a9/92576895166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=dibujos+para+pintar+e+imprimir+de+princesasPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3A 18512 bytes
SHA-256: dbaee383f39649d5876d257248347cecf1074f6a7c355ea4350e1e48d003f94e
font_01_sfnt_off00012a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8C 11000 bytes
SHA-256: e28c17d8e2857a415aa8ed36c7fbfc5cc681d27aebed49157d4151026b8290dc
font_02_sfnt_off000143da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143DA 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off00015950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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