Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f2b2a7d689d027…

MALICIOUS

PDF

107.2 KB Created: 2021-09-07 00:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c70f44361aa8f75574ef6ceb9366c4a SHA-1: f4957b09ebf604c71a323bd54b173037fb70a0b4 SHA-256: 42f2b2a7d689d0274f719713d7cd9ff0a99e433ffd1054fa0153150cd6e329d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://tangiahoang.vn/Images_upload/files/19373140860.pdf In PDF document text
    • http://muacuoi.vn/Pictures/files/jagonupeve.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/gidasusesoxusonadifole.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8f6fc6b72---juwarexiwemege.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c2264cfa0b33a34fb7a2cdc3729978af/pifokinitefa.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/vifolazifamelijuzibemiti.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/24627220484.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/586a5e38801fec520d0182e0455eca2e/nedizisodesas.pdfIn PDF document text
    • http://healthywithhart.com/res/file/mesizusuxakumi.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/525a5e3a08a75542788ff04e7d915e5a/detojekugofewozal.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8d4705f4e---nopikorovawekewovininobik.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/batavax.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/xirapigokele.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/aa88b3bfed342496346c12ff04bc648c/gogokipikaxerago.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/lowul.pdfIn PDF document text
    • http://socialsipahi.in/assets/ckfinder/core/connector/php/uploads/files/58866004965.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/33fa395bd1b7d0894fda23951e00b5d4/75796055978.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/43915320376.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16129fad7a3551---56992917643.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/zudolomovokataxebixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=rural+market+segmentation+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_off00014002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14002 17892 bytes
SHA-256: 285a271a673513fd39ed30c707b1892eb5760ca7e9e4900304a8534e27a51bad
font_01_sfnt_off00016d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D72 11076 bytes
SHA-256: 2e8f78e6f8befd410006ff4fc1921d036458d80c70bf28cab94346cb38d23c77
font_02_sfnt_off0001870e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1870E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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