Malicious PDF — malware analysis report

Static analysis result for SHA-256 d834d14e021270f4…

MALICIOUS

PDF

73.3 KB Created: 2021-09-06 01:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 71039aeefe1bf4af8b09ae65412a856f SHA-1: f50e2f6a0668560909cd5288b7dfbb8186ea3650 SHA-256: d834d14e021270f412457d6f9666050e50b6c7c7a3744df07a355f9f10824954
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://smidgel.ru/uplcv?utm_term=catalogo+mary+kay+agosto+2019+pdf PDF link annotation
    • https://cambodiaangkorhomestay.com/userfiles/file/fixamumunuke.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/br0u8f8uhofb4ktp505q8r6oum/81430608628.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/ae58e39673c55c505efba1138caf235c/9215426293.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/12b85dffa8d8d9d40f6b1506846c2c13/pofogejeziwo.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/6ql8ds99jj4vli77h4kr0jj6ot/lebamabazozuretamukewuvu.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/nakoxaf.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/boxobofujowitovabol.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16093a6c01d2d5---17298492787.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/9032157824.pdfIn PDF document text
    • http://cobmedia.hu/include/14220930995.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d477110091d---22682737065.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/89790466193.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/fotigudegojuluxigef.pdfIn PDF document text
    • http://cjatkinson.com/userimages/siripevanofokodimefu.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/13fc4838e46f0295af9dd9321e7e8873/xarokirasoduvaninijel.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d233feb836f---tanozefavanufojefewav.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a246853e201---57361208246.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/q9mrroukdfpf411hr0tiv5va5l/gedofexutiso.pdfIn PDF document text
    • https://dptech.vn/uploads/files/49257862299.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/85485637683.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/vokakamoxabozorezofasajus.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/23180332751.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-8-24/20210824010247233208.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/81908984961.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/meremututeluwazupobaja.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/livuselalesajilodo.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/0614a9eb2e7d86bfbbe8253775868a8f/52775951654.pdfIn PDF document text
    • 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_off0000b9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD211 11212 bytes
SHA-256: 628b0c70cdafcb1518a22cde1f1f90f6889aebb350389eb44646af8aaa4fd01f
font_02_sfnt_off0000ec52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 16756 bytes
SHA-256: 90f6604a4b60d2e0c58c11b431c641f6b4be5d75e3b78b5a49af8348e62306e4

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