Malicious PDF — malware analysis report

Static analysis result for SHA-256 91754caca41e950c…

MALICIOUS

PDF

88.3 KB Created: 2021-09-01 01:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8aded6a3103c4482a7f242a616c34dd3 SHA-1: befcfd09d3db680b4edc18cbd357e6fdda8140e1 SHA-256: 91754caca41e950c96c2d51f68b60c163e71ed4a47af2e28c851189e86ac5adf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://aarogyamedico.com/userfiles/file/lugakutikoxonutugazized.pdf In PDF document text
    • https://sfeerweter.nl/userfiles/files/todotos.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fac5ab8675---91886327763.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160941df6789f3---jipedulikupuxerawes.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/39247824344.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bbff82ad759c2d21db6ec14c01181a52/36153171387.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/5325480087.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/kotodagapujatoxon.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/25570325756.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/14086332881.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609835e6ca5b4---84343363835.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/xigamefaxidedatu.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/58536169103.pdfIn PDF document text
    • http://npas.ru/pic/file/69121927682.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/75654462586.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/65712783280.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea8eaced5b---78534703057.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/19553c1a3200a25329a84724563c6a30/22201608718.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/mokabupurubusivozez.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/xavutuz.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/28336050512.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/drr4lacgf8qsjce9djsidj2fm4/69155992335.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/10596519850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+odyssey+full+text+pdfPDF 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_off0000f430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C47 10416 bytes
SHA-256: 5293aa28154815fba20538937a62e6ed3d71ec679ef30bf2df95def4bdccc226
font_02_sfnt_off0001241f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241F 18040 bytes
SHA-256: f3fdcb0de069dff288a3e415bea1ff66fa0c3472765b9f00483d148a115ab4d3

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