Malicious PDF — malware analysis report

Static analysis result for SHA-256 43bd1c4d34941512…

MALICIOUS

PDF

76.3 KB Created: 2021-10-05 09:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 45eea59fe3a12789726d668cfd470c06 SHA-1: b2cbf334886e32a85c8fa1bffe8c366949cec15b SHA-256: 43bd1c4d34941512555af35966c531cbe89e697d946dc26325f9bac365c7fbd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://queure.ru/uplcv?utm_term=arabic+baby+girl+names+starting+with+n PDF link annotation
    • http://tutek.eu/userfiles/file/34160485881.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/76407604877.pdfIn PDF document text
    • http://e-sportis.com/images/upload/63779642164.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/zoninenekupavus.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155bd5bef94d---tanowuruvivepopuduk.pdfIn PDF document text
    • http://sooclose.eu/upload/File/zeritumarelituni.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/nerozubonetavumedak.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/bugufulagixoju.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/11756368043.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/ziwubapizet.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/66185217354.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc21628974---6772348255.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/6831832446.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7a5e0b90a---lugatagixine.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/posadapovitalefugixolozi.pdfIn PDF document text
    • https://nusantarabet4d2.com/contents/files/82963416922.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/67247627448.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/29785110719.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109220836273044.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/juzusikevekodemili.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/bukizezijasuvemolo.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/7218440188.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/37838899615.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/sidiniviguzovuwi.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/joguwawodakofos.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/wokopixiguzuladojopalu.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/14773768868.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/farinekagetijororikizeba.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_off0000c680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC680 10880 bytes
SHA-256: 02d89d58386de2c9dbc8a14a64f213e30519deb43d66c0b4067b7d4ad3954fc6
font_01_sfnt_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 16832 bytes
SHA-256: f4c2c3795cfce8d3c2541e94af7e0f11a86add5758b3a277226436ae24b71f3c