Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54ad2f8a40b9b35…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 12:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: deb08553db2d1848df204da7cca78028 SHA-1: b953b2e07161fe9155b7cdd44e62f8143892a1cd SHA-256: b54ad2f8a40b9b35b641ab19584359159c8b3e7f127bdc7806e8b72c4260c7dc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution lure. The document functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised CMS uploads or disposable domains. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cvsc.co/userfiles/file/93093180612.pdf In PDF document text
    • https://asiarsolutions.com/userfiles/file/97133282914.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a31ab00f605---41024439436.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607207ad7f86a---zanikamirizesapo.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/zepopegemepuj.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f34bad36a2---25690065330.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d22f6e3fdb.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/xazimamiwizubapuriwajitaj.pdfIn PDF document text
    • https://alohasafaris.com/files/84880937508.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/27304850333.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ublvc9g29rcl3sm9mmmm8gifg2/zakemebigasiruxovejagas.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/94297145782.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/4jes7o84b4me0en1fnl0c81mmn/fewogezirarevis.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/masune.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/tusovojujulupamigadovu.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c694e473b13---vozogidis.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/8229478168.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/48e7c99dfb4e6b394123194f3e0a57ed/47714945774.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/rexakavaputij.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/1938341758.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/fawijelutokareputurudipog.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/97499694952.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/de04b0186bf69ff9dc87683eac3fc1a8/29218381894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=working+of+geothermal+power+plant+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_off0000de58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE58 17320 bytes
SHA-256: c20847549f279f59b21528338bc7016ef0333d868c2ded70f3572498d0e210bc
font_01_sfnt_off00010b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B19 10948 bytes
SHA-256: 92c929feddd0c80eb36761f1e4890bad742acf785b9e61513ad7caee5eb04f6f
font_02_sfnt_off0001241d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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