Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5a5da219876c50…

MALICIOUS

PDF

76.6 KB Created: 2021-06-13 18:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6b2fe7f6132569e5a0f0afd506814e90 SHA-1: e66c575a8d47e535dd50ce4a54dfcba2e57b3431 SHA-256: bf5a5da219876c50f55135bde5dbf47d1c180a488288c3edfa0b2abb59cf134b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and potentially malicious content. The primary purpose appears to be directing users to external, untrusted resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/uplcv?utm_term=happy+superlative+and+comparative PDF link annotation
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1cf6d4d17d34dc2ab631e3661ca75500/79576112869.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/86625271922.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/54e830a96d05c699fd6205070c4a6ae2/87617339128.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/44e45ea3e6858efa43ddcfb7b7cfcb5b/zivogasun.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d58c77844---kutesegowisiguwoturex.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/9848446222.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/564f5b90e7b20c63aa673ddb5c8a6c48/jevotide.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/pivebijulegolebedulemir.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/cb037e5f82dee97620f607556a0f5cfb/zetewate.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1ee0070bd---6104029421.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/142918454.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/31885191069.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160872f4b74291---45044903297.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2eade9bc8---madosavuxojuwobotesonupij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE681 5344 bytes
SHA-256: 1c6fa1553338d9f83504a9e9125fea083bf90bf53910a1841b7320629ab03f98
font_01_sfnt_off0000f8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 18028 bytes
SHA-256: 0e579a855a263f2e58977058bac145adc36e80041e60af0e5e1cf610f8ce5e96

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