Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b82152493b661a…

MALICIOUS

PDF

90.2 KB Created: 2021-09-18 18:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 814e27878faecfa1e34531b0d8104670 SHA-1: da2b579c30c5e3fe06c069b2049ea63a7dd5599c SHA-256: d7b82152493b661a0fb779e972d9f147477d1ba064ebc97f4836f74fb559797c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and domains that appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://fong-cai.com/upload/files/garanujurubavokejifesifu.pdf In PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e85f819e02---lomumil.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210905143506.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091017181170554.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/95465700384.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/aii5p11pb2cso47918v26agvu7/towugubinugexe.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4b14559d4---28520102442.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/42147077974.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/50985298291.pdfIn PDF document text
    • http://maihome.hu/admin1/file/kefer.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/23464453693.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136a833aa9fb---24709476056.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/79669736184.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/tuvoxokofofisodenolosor.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/161449e275a208---21477841532.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/fugugevo.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/zelelofinipeleruw.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/pegubatatowat.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/55875825576.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/tasowukawajaxuxexun.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/80438767259.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/22031313180.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/wunufijepejimilazif.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/88271595834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+channel+is+boxing+on+saturday+nightPDF 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_off0000f357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF357 20472 bytes
SHA-256: 4cc9310d89c046136e5c36af911b2f7dbf1276432865fff639f6311e8bba8f7a
font_01_sfnt_off0001291c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14133 11100 bytes
SHA-256: ba3e56d39182f0d45b95691becdd16bf0e950be1944146246e685b4ccb41f9db

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