Malicious PDF — malware analysis report

Static analysis result for SHA-256 32bc2f7dae6a1f16…

MALICIOUS

PDF

93.0 KB Created: 2021-07-23 21:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fedfb24f555d5e28036fc8ee47e5a9ca SHA-1: b67b017e34fd2b042991e028f847a95fbef89161 SHA-256: 32bc2f7dae6a1f1679018f4c724508b6ec2d51cb8f08463595018f19f819e489
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. The heuristics reveal it contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's designed to distribute further malicious content. The presence of embedded URLs and the 'download button' lure heuristic reinforce the attack pattern of tricking users into downloading harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca000151b06---39055763268.pdf In PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/7169065938.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/o35j3oskfio2fid67r11lvfb6f/dogevozubadigana.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/xijimojakepavoruladakezon.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/35162128134.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/74355290928.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/7bf50b0c53348ef0be4d08973fde8290/16003366100.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jc4mo8bgsr4me4ptc8v91luti6/77535041710.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/f23db39531603c23c1d82c8d98e7e5a0/79878014157.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af87065bd0e---kebixamud.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/d7d45adba97e66bc0caea2f06d79c0b5/wojesukesobifabe.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/36689208194.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/74b91732b5bb1829b47379c1b8cdebc9/1074331166.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2273bf8ad---88603874436.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/47002659287.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/desofo.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918beca1cf8---vezutisugupakob.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/58548421098.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/86403476895.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7d901379f---tuxifilajex.pdfIn PDF document text
    • http://stattus.com/assets/file/21164866942.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/eb156f49ff81cdb957516c9fac82747b/pikodonalawikez.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/6iltacber3jj4hl40bj1jhqm33/lizunujovamuli.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c67c5c09e04---86645563742.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/h61crmj0e3ftoqo8f40enmtk81/6829637139.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/75839586717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=chhattisgarhi+movie+480p+downloadPDF 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_off0000ec6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6D 17112 bytes
SHA-256: a2c528763dd3569969f05d3d9d2d7f9cc6eb49379076fef036566649c9d80865
font_01_sfnt_off00011920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11920 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13137 11432 bytes
SHA-256: 6fec7d41510014c0068e00aacb8e65b342bc6a4576649c99aae3ed986093ad42
font_03_sfnt_off00014bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BED 16752 bytes
SHA-256: 7c1a8eb0b9c23cf203c969b5d5d5631f8eb4ae760335902abb309347e0b2a7e8