Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb45f2a522aba29a…

MALICIOUS

PDF

85.6 KB Created: 2021-08-18 14:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ac846c391a7faafbc8604a2c7c840c3a SHA-1: 7b2aebc5180f8962c11e9ccf6f8d7b46ab94a621 SHA-256: cb45f2a522aba29ac94764b223d4c2bf230ae90cf0cbd82fe843f62a9f8482f3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://atraba-holding.com/userfiles/file/tebotepijavexarusebov.pdf In PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/0bfbf94e67fb8fefa5de554ecd75f676/4440145538.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a85933e60---lulukivasuvegafuzofewu.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/244773742c726d52912c1f7e38ded957/56768321258.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/nufquchc5kqkuv0ib6p3cglir5/javubuzemufukaxo.pdfIn PDF document text
    • https://biomisszio.hu/tmp/duwisituwemiso.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/sonevukemiputewowo.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/52b6ccecdd3f139886226fde48ac6008/95032652239.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e67c303f6---nabitabizidixefufit.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/6nv73qchvck60jrd5hsmf4v746/lalabikatalom.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160836d67458b9---46951523208.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/55804015129.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/46v12pg7i62l19blh2st2euld0/bureradu.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cb1f4037df58cf079a35cffae7857962/sapaniwodokuzunosip.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/ziwugologulorupiduxav.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/8995486223.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/21548646584.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/97928809357.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/94028285821.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/61d94ebd2f7f411d920c6e89fa266bbb/89143390520.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/16951410212.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a0ffcd519---xosukofexezuxotavebenifa.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/77500125267.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210502195911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+does+tesco+pregnancy+test+workPDF 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_off0000ec09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC09 16332 bytes
SHA-256: 88f24771241a22c08a2c3f51829de2c797234459257be16766e71f42e8b4fd48
font_01_sfnt_off00011651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11651 10832 bytes
SHA-256: d7f6046772c60b3dff56de238adfcab4e88a4e3eef99100512253399a1ba9d86
font_02_sfnt_off00012f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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