Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46df88d38f2400c…

MALICIOUS

PDF

81.1 KB Created: 2021-07-25 02:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a560f2aaed0b9f260279bf49149bf6a2 SHA-1: 738b97b049e69725d9cacd6f7ef05422ac8b9fff SHA-256: b46df88d38f2400cfdbe84badb72d11ca0c4167c8f59c36f91cea96c35336858
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly indicates an attempt to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://poltinik.ru/userfiles/file/lopomosidatowulanetosito.pdf In PDF document text
    • https://vasantviharproperties.com/userfiles/file/70538094285.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/rakofelosizivubip.pdfIn PDF document text
    • https://onlinendttraining.net/files/11453106391.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097abae4c5c2---89247729728.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/refijowixamodogikidekoba.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/jitoxe.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee92bb76d---pidiriwanuxipuzapivejila.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/e1510e04dcad256c1efdb629a59044ab/50786873752.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608f97da4d6c2---nanuzuvenaritupizasize.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16070624eb3ea0---96041298632.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/9099424331.pdfIn PDF document text
    • https://digireg.com/upload/75688211457.pdfIn PDF document text
    • http://ithaca1960.com/clients/8/87/874e400c25abfb160fd1c0cf9913fcd0/File/30245285864.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/43156381899.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/cb0c1fbd83f0a88ee58fa678cc864172/sogofalazufilixevapobi.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/xizipujesubiwifajesi.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/9044286018.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/6d7cede43934b0f9ba10a5b80abe6ccf/wepiponomepavibifimur.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/84770146282.pdfIn PDF document text
    • https://petikdaun.com/contents//files/leguravelat.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/fadelutawinuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=anjana+anjani+full+movie+download+480p+filmywapPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c676f1cf7b2---danabowuvebawuziwudumifi.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_off0000d6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 11176 bytes
SHA-256: d57f246536c31c189a8161425e720dbfa204b699e1ee1c9fa7ae7f3aec367b88
font_01_sfnt_off0000f0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 16868 bytes
SHA-256: 4ac1f68e4791103c81aef11ef0bcc99ae35bbdb5c641f8ad76159c02b03390a7
font_02_sfnt_off00011d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1