Malicious PDF — malware analysis report

Static analysis result for SHA-256 b69a10a2fc7a4ffa…

MALICIOUS

PDF

169.4 KB Created: 2021-08-19 19:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c0a7a6cec8e6b63a31ffba2908f527fa SHA-1: 185af6c64897cc6cc3568a4a6ca23a0186a4e488 SHA-256: b69a10a2fc7a4ffa23b386a0b678c79700948da2ad844617b971fc1a86feba35
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links to external websites, many of which appear to be part of link farms hosted on disposable or compromised domains. The presence of embedded URLs and the overall structure suggest an attempt to redirect the user to malicious content or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://synerhu.ru/uplcv?utm_term=fiat+punto+2+owners+manual+pdf PDF link annotation
    • http://aliglobshop.com/userfiles/file/39203044316.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765cd1d9a98---87201726407.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/4739915471.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/j7fhsp0vks89q8h676j2i8nv3u/82409445531.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/a96f2cd869b81ca356834bd23680077b/fivedisorazadamabovadipim.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a7a33811248046c78e0f34667b9d0b66/93749840251.pdfIn PDF document text
    • http://araonline.hu/uploads/file/pizinotuxivaporadupatim.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8059047756.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/27488074147.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/82973594426.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210629111714_1d4uma.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/24415934684.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/17qvj4godrfgmid4n99j20stnl/fibulaniw.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nitejogo.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae0a1cb201---55319033683.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0793bbce5---53021175045.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/98401c9a153599bca2a1777b2a6e7d65/66876880044.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/fcd7e9b993526eb33d8cb1d7b14b7c1a/wudoxepidepobomeju.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nuwedifimetazuzigar.pdfIn PDF document text
    • http://orhs86reunion.com/clients/6/67/6744625166a0df26c7abb40948833271/File/sibomaguno.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/3eaf5aad790919bcf850e2103642080b/guvatizuzorazinefawerig.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/jutarirenufuweku.pdfIn PDF document text
    • 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_off00021d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21D3D 16084 bytes
SHA-256: 86e84c66d8d6f41aa4fd4ca3112cd9676e96dc3ca2bc086eac79e8f8eb451e33
font_01_sfnt_off00023266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23266 19680 bytes
SHA-256: ea7c5818c4ed205325ca9017cb3a59a250089700e072b49a8a68c8a7f9218ab0
font_02_sfnt_off000265a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x265A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00027dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27DC0 10940 bytes
SHA-256: a20392418a7de8bfbe249d4ea438fcc2b109b71296e134976a92eb3658a274b3

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