Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a35f7457778124f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 15:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 60c8b874896c5f595e278062120db213 SHA-1: 969e2f168c5cc6dda7caffae7630fba4da976f38 SHA-256: 8a35f7457778124f8f07d20469d2460d11131aa206502e425ec3b7380e226abc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm hosted on compromised CMS uploads, with URLs pointing to potentially malicious PDF files. Although no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/7f7adf2d05ab113da36f1d79db3a4d2c/85655611844.pdf In PDF document text
    • http://stringquartet.biz/web/images/fck/file/18661549563.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/17777050223.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/wutexuxuxisedejagij.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/givivazaxuzuxiriku.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/kupunabupedekalal.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/retorogepaxufedi.pdfIn PDF document text
    • http://vhshf.de/File/13005371365.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/75370589599.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/ralolusapexelusax.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d3b0dffb---gedagifikavikudixeloz.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/fuzejafoladigo.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/nebigufoj.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/47391693203.pdfIn PDF document text
    • https://slide-bearing.com/d/files/bizukijopefikereje.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/watijukikudininog.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/sodarivopazamijegisituren.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ced10631ef---98392171986.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/r5835o54u6vsaha63kh724tv06/83564746006.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/24878266001.pdfIn PDF document text
    • http://storemisr.com/uploads/files/6983212957.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/31965690186.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432bbfc9244---56130598999.pdfIn PDF document text
    • http://sdes.in/uploads/gujedixawegosiwifozamed.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210905225145.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/67465084429.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/xufafoduvasuzufuwikelipok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=monopoly+apk+filePDF 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_off0000dce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE6 10184 bytes
SHA-256: 8bdc3262bba1d17117d9c1c7ef6dfec5f447e2be166b87b97588df027f44186b
font_01_sfnt_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 17200 bytes
SHA-256: 98dd27530de751937bdf66ba7484cbe5ce110c6a77ccd846c25580d54eeb134a
font_02_sfnt_off0001208e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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