Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19019fdb4537836…

MALICIOUS

PDF

92.5 KB Created: 2021-06-30 10:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 55ec83533a1a9cfa8a8dd095bba122c4 SHA-1: c6dfcdfcf459d581554fa993bbf049633a6fdc14 SHA-256: f19019fdb4537836b9958b5d2b8d8c2847ed81a8df3ce48b5c5c2ffa393e989a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious or compromised external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://uhy-th.com/image/upload/files/83920224477.pdf In PDF document text
    • http://moto-bike.pl/userfiles/file/28013728517.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160985d3c62f0c---tozaguse.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d77088cf0c7---29926021762.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/dibelamuwidej.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021524841123128.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/s9p5jtauqaqcj4jenp2s1uh3nf/52342364112.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/6956747621.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/h5ab5otg2g077fn8p7ujbq1d49/65866139344.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9e176626e033fa40f805921a754a828e/fotatunidexatisozuj.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/fipepunisudilo.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/43890220984.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/fb2026c700159ac5bfad9a3844be7481/32366962585.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/74015002257.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/xeretimekikidal.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608013546cda0---kikaruromoxovomojaseko.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608563b2480a3---redifigirusulofipi.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/bca8948182f615fc6b511e4c41e8b68b/22328546015.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6f1ed0077a9ade94162a42ad642c2cdf/4014371771.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607361157defe---mivagivedajubuxevajapiri.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/8nd3ha9tj78mqsaf70drl0fcl7/jugixixonis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=sacred+2+community+patchPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 10976 bytes
SHA-256: e2401f3f6330fdee4d202598b27a90b02c6594240bc812ac7242cf2a75d99cfd
font_01_sfnt_off000108eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FD 23580 bytes
SHA-256: 1071624a8a799f1b8f15f7b9151fd3365adb19d8b205363badc77b1d2a8de57c
font_03_sfnt_off00015bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD2 1864 bytes
SHA-256: 3ae51fd610f93fda52280d3587598879eb616076db170d3bcf8e16b1a7bbf2ef

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