Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17aef3c861eb2e0…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 01:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dcf2c8c9fb6774370bf8e21534ee5946 SHA-1: b8bdce40bf2cba84387fb4d58b3bb3e43241b930 SHA-256: a17aef3c861eb2e0c41417421078915db2b40c19ea59a9c93530d9debf0c009e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links, many pointing to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mobiligennari.com/userfiles/file/87749777921.pdf In PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/1651273577.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610087212ee0d---nedifodu.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610304afe3af7---32377728526.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098618342bae---kudagilexebeza.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a61c9e55869---xejogi.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/1559aaa35b1c38d959dc6d4a0d3bbfc0/59514426400.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/52e887eff5aa5894a4a9f1bdc222fed1/98336176856.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/70820554539.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/tuxidovukukapumagaxa.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/kipajowujadewevenaduge.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4d4554948---domilefegopewijadivuler.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/37983516312.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/55744006984.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/pozubizokilosezugemilulib.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfefce4627b---ganexaxabawezorazetizuluf.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/55961230273.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/sodivojuzumojaz.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c29cf58100a4576f13adea923358d1dc/64496627282.pdfIn PDF document text
    • http://stroi-sistema.ru/img/gelumakijono.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/zorefitoneg.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/xujebasonusemipu.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/fixodujejum.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/42341009305.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/23252769571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=manual+car+lock+not+workingPDF 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_off0000dcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 16644 bytes
SHA-256: e4175c3776982024a7cfcb05f75d22cc087a65908045072168730317e366888f
font_02_sfnt_off00011ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF8 10376 bytes
SHA-256: 6a6c56d8bd949ab174e80969617afd38e2daa817b613763cd6969796bb4cbf1e

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