Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5eb5dfa875b2eb…

MALICIOUS

PDF

80.2 KB Created: 2021-09-03 06:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 456f60e2ed45f3bd0a47a2637bf2dcf9 SHA-1: 341b15bddc71015af58aa63a5141a88f0d42dc90 SHA-256: ba5eb5dfa875b2eb4aca772773ff2765ae4540734f4c4f4c9fd2aed54a11c233
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV also identified it as malicious. While no scripts were directly extracted, the structure and embedded URLs suggest it's designed to lure users to external sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://jyjwqj.com/uploadfile/file///2021061720214157.pdf In PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/36867357434.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/didedadesuzelelurep.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/zazoxisafopedozirife.pdfIn PDF document text
    • https://thehouseproduction.net/file/buzol.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/33l9cegi3fs81fgdrb67pn5uij/weguzo.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/d9h8shqeu3c5sa7bk8on9posl8/babafesavijogevuxof.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/50702765833.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/c79e5ea0622de5059f3593eb86b42fb5/suvuredolixivofisotaxexu.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/gipenuzul.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/zudevibilowuje.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/60506880680.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dec2acd1d1---86065177695.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/45720632062.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b2187545f54---83647566037.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/bofazejozosawututukuvopa.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/16246479797.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/67629188169.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607791ae825e6---xapewemirodimab.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/5003865197.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/lariguvu.pdfIn PDF document text
    • http://splogservice.ru/content/file/83811705980.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/l8vf65m7tqkllvcuqe1oan2o44/dofuveburezajajilemat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=website+screenshot+pdf+chromePDF 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_off0000d262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD262 18868 bytes
SHA-256: 000ff43c67f0decca283f6f75d4bde8f558ba9dddd7c69794d2e7df535980e5e
font_01_sfnt_off000102d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEC 10808 bytes
SHA-256: a4f24299e8c8c913f40cab359c0b264e400f3bfe8fae49ca86447fe1e6890c29

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