Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b3a33bfdab70c0…

MALICIOUS

PDF

84.0 KB Created: 2021-07-07 08:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e5d1f91b248b41e880a6a6e1d805487b SHA-1: e4a06793dbe05dda51113607c453a7bee92a4272 SHA-256: c3b3a33bfdab70c0574922a66ce55c9a5c06a7479858b3afcc4be7aa516c958c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to facilitate phishing attacks or distribute further malware. The presence of multiple external URI heuristics and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://philabc.ru/uplcv?utm_term=peter+and+mary+magdalene PDF link annotation
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/blldplrvbo8m6npjc4mdet9af6/bafutipesasumawidukan.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/33546364266.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/99a3020457f66944a4a3b3732cf599a1/vidukexavomisixobogodolar.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/dazijujagibepoxes.pdfIn PDF document text
    • http://jp-cable.com/d/files/78314650839.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/81657373755.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/24408585573.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/85671761080.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/najek.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcb702e53e---jewovoxizonu.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/79669c465caebb31ea0c1533daae584a/nikevuvaxasobigomupinat.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/legubozabagizow.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/mibomod.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/binito.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/42204957656.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f8f52dbca---340159132.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/14ab2b935802ee07d0491237ddbfaef3/99629645226.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/60530233154.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/xufusediselefazuje.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/rematozolonuvokejero.pdfIn PDF document text
    • http://iphysiology.ru/upload/siliromixiz.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/5cd95286d21b9d8f57b11eb6d563e00c/75076907578.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B4 17064 bytes
SHA-256: 8dcd8a83a0963cb09898fe113d46c1bc51b2bdfdaf9d46eca86651cfff3eece9
font_01_sfnt_off000113e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E8 10324 bytes
SHA-256: 8015c8b3a3c2bc9418017dad4efcbc798dea4303b67a94c4c4ace8428361ac79
font_02_sfnt_off00012af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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