Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4149bb7cd772227…

MALICIOUS

PDF

82.9 KB Created: 2021-07-06 21:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84c1dc9b046473630377d07a1051a041 SHA-1: 54ed5cc4b9f81f63b9cd0c76c56d14dbacee1150 SHA-256: a4149bb7cd7722277d8a70d1b3318c44799530fb8c534a62b2ed839d28dea7bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/474d9485a4c84488f0d6ffb7386d1643/jadozikixegurupi.pdf In PDF document text
    • https://aimara-bg.com/userfiles/file/xapefojeg.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/vumuzewodukizix.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca0e73325---bedamekusojuzeguxodiris.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///rugebixapiwuzaka.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/51327539034.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ed43799db2a09515b1ebf2ba9ae1e5a7/delimu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b737e88b931---pifejopakozina.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/b7ot6a9pfc6vrohvfk62ebp4l4/41608478823.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/tijidowanasi.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1e579d2f54e9df8234c1cb6ad6ae85bc/66136018180.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/16704650507.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/wumuganixa.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/mipukaruzumezuwitufomosiv.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/gikudi.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/kijabulanetinewazes.pdfIn PDF document text
    • http://esistore.be/userfiles/file/81483220822.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ae81252f60240661a39733b5292dd5f4/17241823349.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/1952399659.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/koparuteduwe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a105235effb---ritesoxuwolejebusu.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acd180bd20---ratuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+everything+works+pdfPDF 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_off0000e45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC71 10916 bytes
SHA-256: 6d2a8786cc444ca484710402101fa38f444af53424f9c422ed59d4db5cde1780
font_02_sfnt_off00011578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11578 16196 bytes
SHA-256: d79d6d45d0cd3482c8fdf421ea78a25b3644f910dc71d97fb9a17e0dfa9b3a9d

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