Malicious PDF — malware analysis report

Static analysis result for SHA-256 c687aefd7278d48e…

MALICIOUS

PDF

73.4 KB Created: 2021-08-29 09:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 269874f3d6dacd23f0d3e946d182d934 SHA-1: 2f82712f75d821251b2267c6dc6185d1aeaa7937 SHA-256: c687aefd7278d48e9d2be4040a226eb83cb9f7089e36515568995931d31c0a5d
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://ddaengshop.com/ckupload/files/36540256035.pdf In PDF document text
    • http://d4sontario.org/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/5575458954.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f05c570f3---wipojivizaduto.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160796fdd26a08---51306340209.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/b37393b149c44068104c018251c27cc6/fijefepituzutoxusasile.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d31aa7aed---pevekuzedoxi.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611b8d80bafc7---xirelokilenaremubeve.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/voxazotefij.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/18623294951.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/63175670478.pdfIn PDF document text
    • http://slsnn.ru/content/files/67196552227.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/8992335006.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9d7cba314---59521936694.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-8/20210508143516360529.pdfIn PDF document text
    • http://starsunited.at/upload/files/42089612897.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6ba0a2b255767e4fa157fe687fc61bc0/gudopuvopab.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/misuxijekazovulofek.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/76855300772.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/33299857265.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/banubujivenakodefudixezo.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52699f1718---pibubuvewi.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/220595571.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/e44648cbe968d95f2756a399b2c51bd9/90792082781.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc291cdec76---noxesumutukobinupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=max+level+shadow+fight+2PDF 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_off0000bb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD364 10796 bytes
SHA-256: 0402ef4ed79ae71a1ea6584f1f38d670836849dc29ff7eb81d0051ebdd694738
font_02_sfnt_off0000ec54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC54 17148 bytes
SHA-256: 51d60700dec35d193b3fb5027c5e17a1ef52e5921abfcb8942c2c42c12c00f68