Malicious PDF — malware analysis report

Static analysis result for SHA-256 93803e1849b3b338…

MALICIOUS

PDF

72.7 KB Created: 2021-09-06 07:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5975eff4bfbe641a0e4054184cc55c5a SHA-1: 0133cad944e6f2e6c122ddeba6cc7d54042fec69 SHA-256: 93803e1849b3b3381647740f42eeea252f62e23722c3068abd98d50e3769da39
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be directing users to potentially malicious content or phishing pages through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=free+cursive+letter+tracing+worksheets PDF link annotation
    • http://industrialdevices.in/uploads/lurovamuxi.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160908faf55a71---roxategododagudevij.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/34296204733.pdfIn PDF document text
    • http://countryroadssiberianhuskies.com/clients/e/e1/e1b2222506e4b6fd6c510396e08362d3/File/51066671171.pdfIn PDF document text
    • http://24cvety.ru/upload/files/97109072448.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/suzagutateseremem.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609713e750a90---66110344581.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d42aa39b11---11640121978.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/dogudajekeri.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/penani.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/sunux.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57ea942c98---wemomudizemavek.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/fawedipebaxuwugalonax.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/66014513736.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610c0f78f2f9f---39708143151.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161118d3fb1ffa---68282820629.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/takakigoziriwuvetavevode.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/6s2187girem7gq3qija9fo5kse/16611280141.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/6483511528.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/lukinisubezavizoge.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caba09d67d---2921716098.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608689c7c0034---lomedogobu.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_off0000bb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD369 15988 bytes
SHA-256: e7c3f2e149278898adfc9497d1ea5d71556876e94d7e3a4426a4776f6c1f7d26
font_02_sfnt_off0000fc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 10828 bytes
SHA-256: 94f977293b89385e9f9a859ba66700ec894ca45ac5d090f867a8a743f80a08f1

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