Malicious PDF — malware analysis report

Static analysis result for SHA-256 4abfe0766cf156c9…

MALICIOUS

PDF

72.0 KB Created: 2021-10-03 14:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5ce439882b00bba20d951e12dbed2724 SHA-1: c5eb0a11993dfe045c4a14cb24752f5d507c2659 SHA-256: 4abfe0766cf156c9800b11747d093a06a16c05611999fd9dd776657c497da839
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://infrive.ru/uplcv?utm_term=effect+of+deforestation+on+carbon+cycle PDF link annotation
    • https://szaniterplaza.hu/ckfinder/userfiles/files/14892765200.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/37831719299.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/pagivejokorasas.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae6d0582f2---84484148480.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/keragepemesuw.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/v15uld235p94aqgnidmk6agsls/paxudogifazivofuwo.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/2817154804.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/36526922054.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/xiwugujirefu.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0abba0f67---37627961603.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/61826463331.pdfIn PDF document text
    • http://changjiujz.com/uploads/files/202109241819249337.pdfIn PDF document text
    • https://hum639hb2-hh38.com/contents/files/35768572605.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/gekajupokuj.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/piwodefivasugarijigeleje.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/46083720341.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/50656418799.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/fusatuxutiwanos.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b717c1be4f---96309487045.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/zetubajuwesetepovek.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/88265098686.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/17281479781.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/28164718857.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_off0000b5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C1 10704 bytes
SHA-256: 605cdcec8976c3413a50830d09ccc52e69e14788c8200071c19e5065c17515d9
font_01_sfnt_off0000ce6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6F 17252 bytes
SHA-256: 106353be4ad1ab7752b749dfbd0b9dcefc6c0a2e1d8fb2457e7577c0b1a96f8d
font_02_sfnt_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1