Malicious PDF — malware analysis report

Static analysis result for SHA-256 66bca8d22fce512e…

MALICIOUS

PDF

86.5 KB Created: 2021-08-05 01:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4521e9de7857a97e45bc9244d59a1e49 SHA-1: 58fa2c22ee46aea174ec5691dbbc445dd74defaa SHA-256: 66bca8d22fce512e299cc1e29e89b9bc400b534a651b214c07c544a9ce613d22
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The primary attack pattern involves leveraging these external links to deliver a payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac547a51865---tetadu.pdf In PDF document text
    • https://airbays.com/userfiles/file/50038753390.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/35697192375.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/iif0bmcat820qqjf03o90v2j8v/47081939847.pdfIn PDF document text
    • http://cl-pub.com/files/files/65198795855.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/nejukogijuf.pdfIn PDF document text
    • https://norservis.com/files/files/zezunonadorenu.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/2eed1458a2ce59ec03a595a99fcc8fd0/39639585103.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b330b930c04---89749113164.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/95744162620.pdfIn PDF document text
    • https://seikai.jp/free_images/files/vinerilitumi.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/lowogakowiraxikef.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/patepisek.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ehft5e1nb7qq6rptb7ee4fpcm2/farunasopejenuma.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021051503310642396.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f934ca2ab---20640009328.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/44478905524.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160850e1519b1b---wixug.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/9960446469.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160708a731292f---70157975153.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/96343460034.pdfIn PDF document text
    • http://xycrusher.com/d/files/37518458382.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/rigovetugawogoxetaxipanef.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/rosofuporeneduvavonaxuj.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717416d2e18---newuvikijafiwukonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+apologize+for+cheating+and+lying+quotesPDF 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_off0000ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 11396 bytes
SHA-256: 7c5fbfdc9ad9ba0874c0aa80ca23893b3cfeed01f2bcc88135190848e574f159
font_01_sfnt_off00010998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AA 16296 bytes
SHA-256: aae4a27cbf5cbb20f9854a7552e48bb7c377bb2aea563d0a02ef82be4196b1b1

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