Malicious PDF — malware analysis report

Static analysis result for SHA-256 7906c4cba67548c8…

MALICIOUS

PDF

94.4 KB Created: 2021-09-06 11:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fd969f1c5645fce6e1ffc4daf9e346d0 SHA-1: 4e3b4606758d83b96dd971df9113e2ef8298faaf SHA-256: 7906c4cba67548c8c1e8a349298b978d647ed86fefab1a8062290c0350934223
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The presence of external URI heuristics and the overall structure indicate an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://innospectrum.eu/hirlevel/file/dufaruj.pdf In PDF document text
    • http://ccswcd.com/userfiles/file/zigedojurepugal.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/c44c7e6af2e82626bc01a46fa3ffa1ae/55820822148.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/nofitojozixewodo.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/xufevokoreg.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/6a364ad5140e3028cbcc1fefbf9513d5/2063921922.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/1afb5e0829fb561f9f0d10aa18f7d0f4/xelopafomosujoz.pdfIn PDF document text
    • http://ibb-online.ru/f/file/xevefuwipesovalefeze.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/ladekaxasafawosos.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f2384b5203d---xifukajonulozurox.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/6bf32dfd8a7d10acb65dfe442c45acbc/84575718303.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/takufumubitimurutafevizek.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/81892686613.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/dugizibepewuxag.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b42a14c5a47---33458893440.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/85274723434.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/72079642944.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/43766985157.pdfIn PDF document text
    • http://radfordhsclassof1970.com/clients/878146/File/pevuli.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/21260441170.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/11372237643.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/tefawosome.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad39e07999---solatuxulifam.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/jozatazixifawegemisuxebaw.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b0098fa3---75811718736.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/s0cqbjhvmg7ndfk5bu9fiop010/fegozexukanofisubos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=calculista+de+estructuras+simon+goldenhorn+pdf+gratisPDF 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_off0001021b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021B 11200 bytes
SHA-256: c4df316d6c4b037cc1c0603dea739bf98ce19d497dd95e97db5b92a87823cbab
font_01_sfnt_off00011be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE9 21168 bytes
SHA-256: 7264b36a39ca223a95682b6c6a68c8a165529b7afe0254f3bcc39a540ad1d156
font_02_sfnt_off000151d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1