Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad55930f739167f7…

MALICIOUS

PDF

80.5 KB Created: 2021-08-20 08:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 55ff01f2beaa42e37fbb3cd25d8ddb73 SHA-1: 350a3d5273b57bce464ba82824513a8443e4f410 SHA-256: ad55930f739167f753f5eb1c41caecca9ee4ea2d95631f5ba3487da8a510baa6
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/32jv7tgv3limsl49tl1ikgrg24/78957417086.pdf In PDF document text
    • http://www.peretprod.ro/content-images/file/2519946849.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/72891945011.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/325f834049b539acb9958389a0d6421d/damikojatizogibetiwa.pdfIn PDF document text
    • http://saaretravel.ee/images/file/68212298981.pdfIn PDF document text
    • http://myphamasia.net/upload/files/supipikibavujugejera.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/zawagaleribedizunir.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162461996069.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/74519661aece90d6fa474d442154fb74/33055645723.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/teximaritufu.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c555cd03d---mipowisadiv.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7c78799f2---13172129046.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/j3mb86gb2u34js9ooij5pbnn5k/nowagere.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/wipotexik.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/pinesalukuvukatogek.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/gubefojipawivej.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/19313336678.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/32199097228.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/visajumorejerepa.pdfIn PDF document text
    • http://klpa.net/userData/board/file/gukilesar.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/5d05bc236efc9e90f26ae3cbee269f07/ravawamumanomukexodapa.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/towojupetolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ieee+1284+controller+driver+windows+8+downloadPDF 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_off0000d861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 16296 bytes
SHA-256: bd594200b75717e6f2e31b1604c73233abacf386e34dcd50467b1ff8c699540a
font_01_sfnt_off0001024e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024E 10924 bytes
SHA-256: c949336ec0190700e6b0040cadb0398422e9c2192ca021e9ace4cefb3109386a
font_02_sfnt_off00011be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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