Malicious PDF — malware analysis report

Static analysis result for SHA-256 207a719a6dbc3bb0…

MALICIOUS

PDF

85.5 KB Created: 2021-07-14 00:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e8c1f44739db556d09c963bfcfb75f9d SHA-1: 5edefa7b2dd0ff0083b3fa22642fafffd115013e SHA-256: 207a719a6dbc3bb0acb7be233234b8f095b0dae0749d3ae60b1da61823dcaa30
196 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious intent. The presence of a 'Fake CAPTCHA' heuristic strongly suggests a social engineering tactic to prompt user interaction. While no scripts were directly extracted, the document's structure and embedded URLs point towards a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://gulf-rope.com/images/bulk_images/files/visonirilekabet.pdf In PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/bepeledexesigirobafexe.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/c9737a305734aabce9a7a70a689ae70a/xupaxopu.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9091e8c4---topusipuxemob.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff3b0bb156---66558793533.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/76617588535.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73d3412634---lawomurus.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/zinunirifiwokeviwajakuj.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pujuteberizulo.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5de85a2fe---jewovuluf.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7b413c55d---wadaxokurer.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/77623390122.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/69b08bce3cb3ed4810b6fd047cf11430/susofamedoletudegovameno.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/64357015057.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/masoxujebesuvin.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/jowejirofako.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/48785892711.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/vuvagoxasagorufeju.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/9rbgcr6fm6fq127qp8rmttrjc6/38405440957.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a5510f46d3f9d74d1e98ffb6214c2b6a/tadolafufanatosa.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/58338458269.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/20104146668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=all+the+edges+of+a+cuboid+are+equalPDF 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_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10079 18140 bytes
SHA-256: d2b73580ed6f360d6b2578c313451307c689178d62f1c07a9908f0c67e66997a
font_02_sfnt_off00012f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7C 11016 bytes
SHA-256: 6142285c718ee1ad8e944099da7543ecb2581e8a948afb5ef41f52e99db321cb

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