Malicious PDF — malware analysis report

Static analysis result for SHA-256 d337c3007937bea6…

MALICIOUS

PDF

77.7 KB Created: 2021-09-17 05:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6c9451f7c8460c1add6a9e6519c88c33 SHA-1: 563d30c18ed2f21af7e315991b068626601bff9d SHA-256: d337c3007937bea60de09aafb01650bd562389de90dee71d376c880a4a80f864
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://wastran.ru/uplcv?utm_term=grand+theft+auto+vice+city+apk+download PDF link annotation
    • http://villa-margherita.biz/userfiles/files/xadimari.pdfIn PDF document text
    • https://eventaipei.com/upload/files/79980451450.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/67992624672.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/16199558030.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/4hjfit6qvcakcqhhmvebquf410/1775089656.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/xivazajamuvasonosopamo.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/sobaruwavekukulefunanan.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/mizobigisipixibonade.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/5b2aa1d3f3b63c4da5cc9d09282a3920/punuwupexixis.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/76c9c9ab2f358161ce87cb446ac5dee9/domukofevefuvinitovogif.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/52837331823.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/wamofolanawukedap.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210910170347.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/raxofu.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/rogelupojalejulupiba.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/kirevonumizubitagilegekom.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/megoputabinefewiw.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/10358205135.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/puwodigirozejasotunafabep.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/raguxibujifiwi.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f18f9afe74---lotexufaz.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109021241288165.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210915/files/20210915162355.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_off0000cb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 11044 bytes
SHA-256: 91150bb1a8ebbff925442aa7a3b0495da06aa2de976bde9b3a41fe6c597a6f0c
font_02_sfnt_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 17296 bytes
SHA-256: 8ddea0ca7f0f4d069f1d387bc0a1105f0a513726f09a726d57efe612ae64002e

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