Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7e3dda5114122d…

MALICIOUS

PDF

75.3 KB Created: 2021-09-05 05:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2da73fd8a71c9b84f0a329802ec46652 SHA-1: c7bd27bf711fcf611a2c2da3a384a2c50531c272 SHA-256: cf7e3dda5114122ddb2a0c44552945dc7105f273835fb33a8df3a0a26e858980
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of these links and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://dreamcatcherltd.com/userfiles/file/texopuneletaxu.pdf In PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/67625307891.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/11063085352.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/wuruzer.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/49116473979.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095aeeaa6b16---xisetegirovovidu.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac21593c9b5---31477394788.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/87li5hio4rh8ffaomd5lo5afl4/7241124102.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/luduz.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/nekeg.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/84658980881.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854b326e369---8942870898.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/fepepivariga.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89574b351---87768574391.pdfIn PDF document text
    • https://wineart.online/userfiles/file/kisevixu.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/rutefafunedigigimo.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/dexekumavad.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/22342379965.pdfIn PDF document text
    • https://hse.tw/upload/file/pokebiripiralulusegi.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/tubafadutudegoru.pdfIn PDF document text
    • https://norservis.cz/files/files/kazixoruzovokumujajujukil.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/84794817423.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/kisukabawavimakorusuzex.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/q795f1jelbj92prfclne7d4sao/85440572547.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612958ecdd606---zidukego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=siemens+servo+motor+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FE 10508 bytes
SHA-256: 31fd429c44ed0397ce342949343c78d465c66226539a941a297affe85d0b9783
font_01_sfnt_off0000d0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DF 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000d8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D7 18176 bytes
SHA-256: d7c31d03a2c83472100d5cb2667a60cb8141a9ff7040ccee1ae7a276addd8aa6
font_03_sfnt_off000106b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1