Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d57197add2f841…

MALICIOUS

PDF

74.2 KB Created: 2021-09-01 16:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4776bc4a0d020d379a27c3e78cf10cb SHA-1: d13b67f8ad7aff48f3f9806cc1323054259d5b95 SHA-256: 66d57197add2f841add0722cf2347c28dbb91a596ae69a60b3926a26f8e2c686
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. This suggests an attempt to lure users to phishing pages or download further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://medvor.ru/uplcv?utm_term=plant+cell+city+project PDF link annotation
    • https://hometeamcorp.com/images/usr/37079176051.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/9536738960ed8c0e5c377.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a164cc0382---vaninabogumexuzaxusunoro.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/244dd2e0a4c412fa6726c6da9f6aa3c0/37634786240.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/68548897770.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0140b200a---gevoz.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2267228ec7---kolewatubujaf.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/b1o3403nsmvkcnisqgi6ja7sae/55356588193.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/72282657351.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/jaua5psh036sr1th8s2k1euru6/33951096296.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/87374778872.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b070a93171e---fisazeziso.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bade9004661---mefukupukuzalilegukulog.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/16631119786.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/nc0boo59rkijol8ita4lkbhh8b/kujipobarodiliguxizaw.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c59039c854---vavesarediz.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611c75d47b139---gigopafetat.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/kufus.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/jezilonejunefabifugi.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/xawarofajapinutolodejele.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16252634242573.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/58268662260.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/68904428869.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_off0000c0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD908 10444 bytes
SHA-256: aa8ffa6cba48d48965761459c7aeb05b5ed4a78c78bd59c3bb62a251dc231ac0
font_02_sfnt_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 16420 bytes
SHA-256: 9861975d5bf31421e051ad3952197f2b86f02894f0f3a82618e0d7cb649e2b2d

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