Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f6567087cf8f67…

MALICIOUS

PDF

595.3 KB Created: 2021-06-28 04:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 687db4c453bdafb8cb8d0f68b46f525c SHA-1: b2bafcb8f4d6d5ad5a4386431dd0b896fbde7e3a SHA-256: 54f6567087cf8f670d80bef713bc64cc0ba566475938f7c3cf0663fd77ed0f9a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a phishing lure, specifically a link farm designed to redirect users to compromised websites. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to trick users into downloading malicious files, likely for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6980

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ab973230c83---romig.pdf In PDF document text
    • http://www.biotanika.pl/upload/file/vanemesata.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/diwitazojamup.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6726268a11---71214057012.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/lebiwufixukika.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1e2856c2f---18321279638.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/a09a165704fbe4cc60ee6843c504fb2a/gunirubofajosubuditefajax.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/81233410406.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9ed2b8fc4---99190904358.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/f2tt2162k8nemrpbhph2qbbek6/kawomosizumiten.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/7039799873.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/ofjhm2shc37dam2q613nh6r1e1/mevizakomulopug.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/fadorezifijawel.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/ac3fce749e420978fc4ec845cde74afe/biguve.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/69940072472.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/58280253964.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3418b60d1---92121510928.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/u6jsum9ppmdd53csgqajd2u1dd/texagobemomixalaviv.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/da722ef21a16e9ad3d037b0e295f8c30/97742491386.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c49348442c2766e63b590f14a565aa5e/nuzazejizumafizazareriwem.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/71134168077.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd83eaa4df---18408201772.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/56380637577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=fundamentals+of+electric+circuits+7th+solutionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0008b006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B006 24748 bytes
SHA-256: 5b33189b146eac891e1e21d84ade9b230487185841f2d4b10d2c1d6e7ad251ee
font_01_sfnt_off0008f445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F445 16168 bytes
SHA-256: 34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29
font_02_sfnt_off000909e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x909E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0009220b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9220B 10868 bytes
SHA-256: 4600bbde0fe66d1e1084555836744b64f73dde017afa3c6afd19e0f04c494ebf

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