Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed79da859ecf247…

MALICIOUS

PDF

87.8 KB Created: 2021-08-02 08:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ea0cb8ef6600975e789e5c5e6cc89de6 SHA-1: 8d097718861b63a7f8ed4d9f5e3c79e690a7eeea SHA-256: 2ed79da859ecf247f97a88998e00eafe625b5e2c9d991ec839f34d0c49105940
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://wastran.ru/uplcv?utm_term=present+continuous+tense+exercise+hindi+to+english+pdf PDF link annotation
    • https://www.myosiaffiliate.com/199trust/img/file/baxeletijoloro.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/bapufasokisipazumu.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/beveruvumorul.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/22690471842.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bec09c729d0---56149064215.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/vuxobilejewoludikadenato.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16076910b81045---gimipolefipewufenazev.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/37342284200.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/pumatexizuzulowaselawedig.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/93051531498.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efea82fec7---dabasenejigikujegeku.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/3nub6rp9kai27uekn71d1e59ki/limigusuzeperidoba.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/28474882852.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/kh7s8a9nb2fcmkv0i8siqas8t4/mizobalawiweki.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/piwaburunuxukerefuxow.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/14160812720.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/e91fd49e7fded21f882f0ece89435d72/wukojexefawuxefopomu.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/cc4692af2c804de3ebfbda243a099c86/zutupu.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38c74b82fe---zotepejevoj.pdfIn PDF document text
    • http://taniaandjohn.com/clients/874109/File/bigijegunelijitewuruvadob.pdfIn PDF document text
    • http://land89.com/ckupload/files/tebixaxonusoluwesisokaje.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/duwofebimevikewutexu.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210601050330734706.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/jb4qi863p7marfr97oopjtrvs2/7591511262.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60cd9d3bc5---vivinako.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_off0000f355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B67 16816 bytes
SHA-256: b4c3305b34d9db3400194f7e983ac744ffad41a478b6ec3db7d8353a81976535
font_02_sfnt_off000136cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CD 10940 bytes
SHA-256: ab25582f2feace7c989f54d444f15807218834cab3c8434269db8127c10cc5ab