Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ba645d775bf7aa…

MALICIOUS

PDF

86.8 KB Created: 2021-07-30 14:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 265065cbd13f69f9aa95b08b77bcc5ef SHA-1: 4544ad681388313d5d5acc37c0a4a6bacc8309c0 SHA-256: 75ba645d775bf7aa0f19fc46c47ec3f0680a93e6530657b19780854912f64729
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It functions as a link farm, directing users to multiple compromised websites and potentially malicious PDF files hosted on disposable domains. The presence of external URI heuristics and the ML classifier's high confidence score indicate a deliberate attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/6bs1kfafu0rbvelv1s4p50qtep/22119545459.pdf In PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/f1dmg9p0i3c35787eapft3cgq1/purawobiz.pdfIn PDF document text
    • http://wrhs1976.com/clients/0/08/080801f2a31a95d446b71e9836a5425d/File/65143858463.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd37d757a5---pepevozixorotejixunas.pdfIn PDF document text
    • http://becucci.it/userfiles/files/45531549575.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a61e13c3677---nivafepeselalanafuge.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/11941700478.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075959f75583---tovenijanagomeroxajanod.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-27/20210627220310764264.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/50051649149.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vadiwaxa.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/4t8r4o3o4ogr245rp8669cq582/vazag.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac67dacae29---golategin.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbdfe4c505d---24913345205.pdfIn PDF document text
    • https://thepainter.asia/upload/files/samopazujoxetavatemuj.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/kk2e1f43k5p691grtgsadv2crl/bamaredojenofuragedomati.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a229ee4330---lolamanasisagutafaxojuker.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/rejadepopev.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/b01e28c091f37860d2d25c54da68e8b5/ruzakosidosesalabibez.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc05e55201---32330675466.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086d673a7704---93404216237.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3115bf16cd---11922127654.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7f3a8e78---80576981405.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/984b8efaf675abf726138f768a0b7bff/64491873351.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/5812091873.pdfIn PDF document text
    • http://cortabellanews.com/userimages/43650833713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ielts+writing+exam+samples+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_off0000f19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B4 10860 bytes
SHA-256: fa4102d77457eebdd2c2c68236c63b24843f99c8fe2fb6141d706c53c1536723
font_02_sfnt_off0001229b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229B 16516 bytes
SHA-256: b51bafcabd4f66e4bd640a5d9969495bbc148d62c4f3c5e4db30c30e691679a2

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