Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad71f3d607844bd…

MALICIOUS

PDF

83.9 KB Created: 2021-08-17 16:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2a52f4d8fc288d8aeb13190612cdd9dc SHA-1: 7e59d8d47abba8b58e08a0f67ac2d7fe237d7e66 SHA-256: 1ad71f3d607844bda01daa4c7d59ec3bd29c5b31c3aace2f1cdeb4700910831a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of a QR code lure further supports a phishing or social engineering intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crysiq.ru/uplcv?utm_term=manual+digital+istorie+clasa+7+cd+press+pdf PDF link annotation
    • http://king-ber.com/UploadFiles/file/20210718001521639.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/2bd9ec1c907cabd2e541d30556e7a35b/tirefapaju.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160864a056fb04---bomog.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/wewegegitoxalixubo.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/81168104056.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///zanatujak.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/69b5a8c2b5957266ed8769d8ea35e694/koxet.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/84979287223.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/tevatug.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fa099a114f7---vavux.pdfIn PDF document text
    • http://health-bridge.in/upload/file/vezerawedejulej.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c79f175bfd0---navibivapavopiwubotole.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b96615b76---72290555742.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/l3det373kekvjoeun0gnrlaokc/rurozawesur.pdfIn PDF document text
    • https://adikketiga.com/contents//files/58970343417.pdfIn PDF document text
    • http://dothi.info/images/files/lasasoxekiw.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/91258025703.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/gurokug.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/f22f80f6833b57186bb21f1aebf0f0c3/vavufumoximigalipoxim.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/nusuvigetu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610bb3bde12ce---2842571991.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_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AD 10936 bytes
SHA-256: 78ba364573992f30adca860222700d6a6e4949e3c8667c376df8f1042ea7f275
font_02_sfnt_off000112f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F2 18780 bytes
SHA-256: 6de599ca73ecf46c88ce9abbfc1aac851d32c1edbc06f34f44930ad5b6ed8acb

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