Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e9908dd5bead837…

MALICIOUS

PDF

74.4 KB Created: 2021-09-16 15:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2322109e0c503fbeb2bd43a51854d92a SHA-1: b687b4a47d54c5eb34b8ef2c8f8a24de0343c7e5 SHA-256: 1e9908dd5bead8372087e54f3816f4739cfd4ea0a9ddd23a544ea336ca7e27e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file with embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The presence of numerous links, many pointing to potentially compromised WordPress upload directories or disposable hosting, indicates a link farm designed to obscure the true destination or distribute further payloads. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://shian-jin.com/UserFiles/files/tenarasale.pdf In PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/kenosowakibinolevavekam.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/60109308026.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/jezavuwiset.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/20986938904.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/27849645155.pdfIn PDF document text
    • http://kag.fr/userfiles/file/xekosodimararegulofamava.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/pikidowajafosililozubakag.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/remasoxozirosajivenitowi.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/tubadizi.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/92f8f493e03688dde1b70cd899a8354d/xemadezujapejup.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c3d0bc333---71390399874.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/80921565918.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/72067642383.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/davikiporu.pdfIn PDF document text
    • http://www.bash.cl/media/file/28083615875.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/23298812387.pdfIn PDF document text
    • https://proia.bg/userfiles/file/zabemejunipuxezoxuwexex.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/lagawemelopeziteli.pdfIn PDF document text
    • http://mosjob.ru/images/file/majegujag.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb047c3c0a---pofobi.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/32790693145.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210909145241.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/jumoraxorubibobepa.pdfIn PDF document text
    • http://d-innovation.com/upload/files/polaxuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+secret+life+of+walter+mitty+full+movie+online+freePDF 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_off0000bf3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3E 16320 bytes
SHA-256: 3e6910fa93af4c472be7b4e4a4e879fa85d243545cc4d971899574ac125cc60d
font_01_sfnt_off0000e990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A7 10932 bytes
SHA-256: 2d5a9337feb3aa89be6ac81a6ca4542d8917435c5fc07100a5a2992823299b39

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