Malicious PDF — malware analysis report

Static analysis result for SHA-256 6135d69475984f86…

MALICIOUS

PDF

75.9 KB Created: 2021-04-27 18:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 817bc16564d94b8b81a9738ff40bee11 SHA-1: 1f9ddb4bac8b8eb214e1714b82c4511f4eaeaf9c SHA-256: 6135d69475984f86d976f11c3b40343eb3714c223cf5bcdbc2640f84c4fb6c88
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristic analysis revealed it functions as a link farm, directing users to multiple compromised websites, likely for phishing or malware distribution. The document body contains obfuscated text and metadata related to its creation, but no direct instructions or scripts were extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/4228bf9a3f84f4c7f0501096b1fda04a/kuvimawid.pdf In PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/f372306b736e5a4b47d480c802ba5bb1/lojigatagujike.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804678632cd---tuvemixamopetewevilureje.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/ba2a68bfff526f33c336ee5ab30fc608/21155603055.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083728a9fc15---fekizojuzurogemulasijaw.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072dd8ebfa6a---49975012990.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607516c95d7eb---vipexavefezemakefed.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4075443a3---baxejeg.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5e2ca491f---jexinaxagudiwesiwifomof.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160820ecd43a22---kofujalalakugurofevutev.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/651a6fdebbbd83ffc6d32484bcca6cef/goxapodefutefi.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/6ca7fe2179a6f67ce4becea6bd6445cd/kimuvaxizuxesufafowuxo.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160704093cc8bb---33444120560.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/bc5fcb3855f8c3ab6dfdfa468bad5c8a/39125502411.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160877497b8535---72463114844.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/dabbaa2a9fb4c6b267f0db1fb1760777/34667344883.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f62234bc989e7944e0898c9d0aa27dcb/1540358550.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/un52469ivp0fcrd2hf84j8u6b9/13653814957.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608536464f41d---89320149652.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=albion+park+high+school+uniformPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB36 5624 bytes
SHA-256: f869b4f23ad8e07e4a6705223f19c41c75cf82bb6e5cebc8d4f043105b4ce6e8
font_01_sfnt_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 10836 bytes
SHA-256: 694ac2434901cd9cfdf7fc966ec30729a0ce5d02f0ef57967c70009d0fc7bf58

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