Malicious PDF — malware analysis report

Static analysis result for SHA-256 136b4ae91f766363…

MALICIOUS

PDF

85.6 KB Created: 2021-06-28 09:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: af4cb6dffba599017dd2e64ce3f56ac1 SHA-1: 16065490f83bc17627b54aa0b581743221214ca3 SHA-256: 136b4ae91f7663630556ca8bc70e243ce1eea587d58b7eaaec3e3e186899f7ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://queure.ru/uplcv?utm_term=who+invented+the+steam+engine+first PDF link annotation
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608028655b45c---19199447996.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4589b7b456---48794898030.pdfIn PDF document text
    • http://newo.ru/files/files/torojege.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/54399489546.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30bdd5654d---narepinamavumagage.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/5d884f6dd0e93b4e0017c4d1d842fa1d/pobenujuwapibavo.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f4a08009e---24928075336.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/2354tlar4iggnj9ecv511pscb3/30016628870.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b054903524d---megogeruzor.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3a0cbdd4850e402388a6bb9f6a4eb53f/78929350186.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/519d99a39e3ffe6c7c5f5a113dba0dca/23462201595.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/3a814944c71b210f076f81bca6634f93/41980821510.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/k2n00aecda4k2onbstr3ihu2r5/tibodugabe.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/razukizujalawusogefajojub.pdfIn PDF document text
    • http://apvn.info/userfiles/file/82365452329.pdfIn PDF document text
    • http://effektfilm.de/files/file/xobiwudo.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd735990acf---jobuxavudesakivekugef.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/99f8d3c5847fe5b93d96343067b35d87/56591218401.pdfIn PDF document text
    • http://partnercable.hu/files/59551437912.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/j14nucgoogaj72tespg85k5b58/kabobajavijabezeraxejimi.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7baef13576af23d32c368b18ec312b6e/14067167742.pdfIn PDF document text
    • 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_off0000eef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 16152 bytes
SHA-256: 62724c1c5cca6eb93797abd4828945486ba417ab4a0724b14bddcad1ab34221b
font_01_sfnt_off000118df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F6 10812 bytes
SHA-256: 95bf1f0db6dfe3e996f7cd235561729ac3b9e041a758f34885bd128517a5a77b

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