Malicious PDF — malware analysis report

Static analysis result for SHA-256 b477ff58278a3580…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 11:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3fa03704c0358bc538e4b1a960a7ab2 SHA-1: a0b45a90ba7756eedf6581abbe716f404c507d99 SHA-256: b477ff58278a35809d15fbc8a24c2dc9225449a959cdbf3db99bc8a0c86668aa
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many hosted on compromised WordPress sites or disposable domains, suggests a link farm designed to redirect users to malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic indicates a deceptive call-to-action, likely intended to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=railway+recruitment+board+previous+year+question+paper PDF link annotation
    • http://catherine-massage.com/ckfinder/userfiles/files/folenanujikavuziminaguxa.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/85f1525f062b192b69ab087516f0c5f7/kaginebavotiguf.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/60323084124.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/20328410120.pdfIn PDF document text
    • https://cristalensi.com/public/File/32149767247.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/1020b982540c8f4abce6d48964ef7883/figuludez.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/66822974894.pdfIn PDF document text
    • http://freetds.net/userfiles/file/82005354025.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160873d777feb7---20108994531.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/kafqmfb7271ot8gocu8t9t111q/33770816451.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d27cffe690fc18acec300712ccbdcff2/79560217857.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/ludeworijixe.pdfIn PDF document text
    • http://huntland.hu/upload/file/25987826407.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/58474885193.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/91116357732.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/8bb81f0924d536961ef0c06cc760e3ee/linawujigami.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/61bce6a9d7f216ab9898d6d2e6b068d2/81773666840.pdfIn PDF document text
    • https://kimcert.com/E/file/sedotibisifun.pdfIn PDF document text
    • http://nakatka.com/files/file/54767170285.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/ramozusixalogedunoj.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/97342792195.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 11372 bytes
SHA-256: d92b5532163d3627c18c0747c541a0eacb3a76702ae8bc0021803c3f4ab14ff2
font_02_sfnt_off00010b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B22 20308 bytes
SHA-256: ce508449077b8d5eec48d4fc046177ceabdf93f517852861917f7dd3492ac651

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