Malicious PDF — malware analysis report

Static analysis result for SHA-256 702c437c923404f7…

MALICIOUS

PDF

89.9 KB Created: 2021-09-01 13:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f7ab973e16429871ff12c3aeb0175298 SHA-1: 8d5f9d53dd65680e3b3875724071795b31ba859a SHA-256: 702c437c923404f7778e84bb14332debfa1a731690d719693a972066681287af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Embedded JavaScript streams are also present, which could be used to further obfuscate the malicious redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=l+personality+traits PDF link annotation
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/281a0a3c892c5bf13808d96cbc49d3e2/77231077470.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/48491502465.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/ca126567379354af20548806e1eecec4/zubigatijemugasito.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/sokagasamit.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/gemoreximumamej.pdfIn PDF document text
    • http://remobudostol.pl/pliki/74141412220.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/mosuwapoxirobanozux.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/51506511858.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/mcl2f887aoijmkjemoir5fvk55/rusixixogafajak.pdfIn PDF document text
    • https://banghenails.com/upload/file/fopafotegifatewetali.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ff0d0e181---purunavap.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/sufox.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0bc4fcb944d189f1d79ae7fda9c189fe/zolorexu.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/mugirubawize.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8656009d8---48266578813.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/67929487705.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d78464e0257---gewawetofegenuku.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/5k4oavvk5ji82r1plvqda6g07v/fifita.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/38987008968.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/vuwikupunuv.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/94ukkkguoq31s8bg2o63p1ktnr/jifupogibudife.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/26569298794.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/445f587f7358fe6062e9fad31a8c43ad/5163281274.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907f8d34be7---jozozaponozapa.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_off0000fa14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 10316 bytes
SHA-256: 2c973602b406bd5d1e05f95550f00219d401fe0f628be6cf3db31f27064e2466
font_01_sfnt_off00011175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11175 18604 bytes
SHA-256: 147823d27bc94d7d141caee64bd2db985198cdf2b74f116b3c127b2ebc59fb17
font_02_sfnt_off00014136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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