Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f847b33dcb04c8…

MALICIOUS

PDF

89.8 KB Created: 2021-09-05 12:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c4b1f0053959f37dfe4173c594a3bc38 SHA-1: bd785a35281df31ad4c49e74699ffeb05edae047 SHA-256: 57f847b33dcb04c8a09c035917c07f8b2e21b9224c108963aee861115de46d24
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised websites, suggesting a phishing or malware distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to open a password-protected archive, a common tactic to evade gateway security. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://medvor.ru/uplcv?utm_term=convertir+pdf+en+word+sous+mac+gratuit PDF link annotation
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958b511eefd---13976411357.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/775802dfc85dccd4d3c30664598a2cc6/xudovajaj.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/xatebuv.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/16719193122.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/c24e7cc9f570ffc26d116c5fe7bab143/jofidoguxunijidekosuxag.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/gapedu.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160956a3dd8aa8---84437231928.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/15927703617.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/6418456098.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/wonunite.pdfIn PDF document text
    • https://baongochoa.com/upload/file/65406324151.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/39126674294.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1610f093bb4d17---mivalibenugerilobeka.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/46005736023.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072090d1f1c4---45299417428.pdfIn PDF document text
    • http://raczcsalad.hu/files/15270481184.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5a867193---naturudexobetit.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/sulit.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ffb48e54b---saner.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/47540063051.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/42337402689.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607748850fd5b---boxuvoloxa.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/tejuvusodit.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_off0000f267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 20760 bytes
SHA-256: d232f1729315946012b6444b9b372d3f3c74e7c70e2a6a1b5a95df36693adfb5
font_01_sfnt_off000126d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EED 11200 bytes
SHA-256: 91bc21aed0562ad2d42e1984d002525e51ef4daf0fe5871b093f34406e8f9e72

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