Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e3b434cf98b8c18…

MALICIOUS

PDF

70.9 KB Created: 2021-09-20 05:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 29ffe5f95cd147ff03f2e67342502a9f SHA-1: f58919b34134b5863f75baf7cf3f1631bc783e31 SHA-256: 8e3b434cf98b8c189d62e1596b4d71bb3aa377fe4c6e37c3a20bbc2880861169
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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, some of which are specifically identified as compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/098925246108be20bfa11e6ae95becf1/9091700106.pdf In PDF document text
    • https://mimpiindah88.com/contents/files/zurogor.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/tiwidapunivamisalid.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/75952688074.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130eeb86d1ae---titozetijewiwuke.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/nipisevarigi.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/1b6437acc6f4652a82b8c0e7fef5c57d/16903138621.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/47731220504.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/safodobamevixofok.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143de7c07668---pagexafil.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/jibisiluvesixiboxesaravaf.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/80350558444.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d4adc576e---87360086918.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/sijakufudar.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/56212315040.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/bivizewujevoradiv.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210912225126_limdh7.pdfIn PDF document text
    • https://netlandschool.cl/files/kamazisonabaled.pdfIn PDF document text
    • http://flomojapan.com/upload/files/75543011732.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/kakilarazejenuvopazusu.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/55612578626.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/tulutopogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cool+copy+and+paste+emojisPDF 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_off0000b543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD55 15508 bytes
SHA-256: fb744d730a4b4e441f5faae68f66d2f75f208e23f31c0119ec12019b19b3214d
font_02_sfnt_off0000f4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 10848 bytes
SHA-256: 8ea963ce0e690d4c050fd2c3b900e2ef82ed756e8714b4a4c4130c01c90e4dfa