Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22725e0c3c17a52…

MALICIOUS

PDF

71.8 KB Created: 2021-09-01 23:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bbb717d34a619cd5c140f53ef60f2584 SHA-1: d543e6113ba3a78aa9b2584d87ecac3f2d5eac71 SHA-256: b22725e0c3c17a52ee6b6d87a7c191f29fc7f2668aa165d76174f7277cb67e00
164 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, employing a link farm strategy to redirect users to other malicious PDF documents hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or further malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://bakoca.hu/files/file/95221028121.pdf In PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dd795cf90---35894787046.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/kozebipevidilozelifuzis.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c8139bf02ac9b000b02e17b829b129ef/lufixejudivom.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/b8e13c6c3663f5b90544900ff6612b52/65309617151.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/cc54a86e621c8a905fc8616c261c374b/juwibetadof.pdfIn PDF document text
    • http://nemochem.cn/upload/files/jewajaw.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/18942561614.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/direrim.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/53384672110.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/97c64a52abc7f61197c0ca31538f4792/31711902671.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/a2b714579aa69a37345dcbda1faa5793/nigurole.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/atp484s50l4rdnn5sl77f4i4v6/7130688178.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/misipoxilumegoguzu.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/81528950088.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/difebagolupixefuvod.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guviruborejovupurute.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/melamalek.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/dasumevo.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/fonelifonijezawipufu.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/15045050655.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/dazaxowafopazezipiju.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cea7474d4---31620752189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+do+kittens+like+to+doPDF 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_off0000bb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD367 10332 bytes
SHA-256: 4a428896ac6cdb415e691dce5b207fe7d89a780bb49738bfd362ea4b2751cb98
font_02_sfnt_off0000eaa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA6 15292 bytes
SHA-256: 10217bd352a34e9564e4a8a37d9421b63d2953ea07d1341986f97567cdcd3cac

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