Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43ea00fb4f3976f…

MALICIOUS

PDF

84.1 KB Created: 2021-07-03 17:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 80b1dd51de7c18cd4fd3ded0ca2d997d SHA-1: 691c2f2b4037e4167ed6ecefcc5a28b15f5e1d62 SHA-256: a43ea00fb4f3976f6cc80162c272a01d93f2a777e1922dfe5c734e7f9e12bf34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to lure users to malicious content. The document's structure and the nature of the embedded links suggest it is part of a broader campaign to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=rdr2+lady+slipper+orchid PDF link annotation
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c692ebcd9e6---bogipowepu.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096918c849f5---sanamogusoruzusukatit.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/xagurobewedaw.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/38a7ead7a699acd0b697623911da9558/fojuxuxipewam.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/a6df72f2ab087f4c0a48463a9f49bffd/jagizaferuvekugevupetale.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e2a0328e3---39106717552.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/rodijalew.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/42221063678.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/f95a0512351ba2ce8506a14e4f909e5d/vudixelepewovulosevebuxow.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cd9f88392---lexepuvagogiji.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/tepovutuxujumofamelibunu.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/ruvigukilamoxisifonos.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62ca4aad14---doruso.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/23859625737.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/ded97f13081c7eb37af896801235c1d1/20204334741.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0f01a4a074970732caae7d2c6ff087cb/41947863046.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/kqo98ldfuparmb88kncjb6u78r/fozudokof.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a8f4d5505e589a1cd1016c551ec6d058/navojarowezerowepeb.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f38d45f16---gokofajiripopamidaxore.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/caf416baba6435a6c914adaa2fd68c7c/37421647086.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/40741305162.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608caa64745cb---93441294923.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b06b930397a---2531197329.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_off0000e498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 10688 bytes
SHA-256: c6a476ac28cc7f98764918e3f8f3fe5e75f7ddc0987b8f23267821350294fbac
font_02_sfnt_off00011559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11559 17528 bytes
SHA-256: 507f935fc8ac35884ecbd82f456a1a0c9ba1c3eb4d493198257e2c2636aee3d2

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