Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7b4b81a201da7a…

MALICIOUS

PDF

70.3 KB Created: 2021-09-08 10:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ef471f40719fc23df136446ce68cc8bb SHA-1: ccf9f2046a3e12ffc75b5718e36e1bc680ccea27 SHA-256: ba7b4b81a201da7a78cfa8f36803fb86cb73c28e96262d65196127f6b27bc49d
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The presence of these links and the nature of the hosting indicate a phishing or malware distribution attempt.

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 http://chandigarhdatarecovery.com/files/file/tusurovekurul.pdf In PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/813f731be721a358378ac0f8bda840d7/tafunopezavitikibakixobis.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/foxak.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/44480314183.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/zurorekete.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0539a28cd---tinunixipuxelidodotimopev.pdfIn PDF document text
    • https://whitesal.com/data/images/file/1572_20210520081416.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/jejatamememugeno.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a802de0bec4---37943057002.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/lilusufofixoronakofe.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4fe7ac58c---82833374893.pdfIn PDF document text
    • http://podushka.by/files/files/45210063915.pdfIn PDF document text
    • http://scsytech.com/upload/files/54354228689.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/jawakom.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/31663238701.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/mut5dj81tpmnh4ala8a9gjkogc/ralafoseruvedavofexan.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a9535be4eb0---nemiza.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/tasegijafawoxojo.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/3fred5hrke2flbsu1chlo7958m/vatobibuvologi.pdfIn PDF document text
    • https://wita.lt/images/files/lagava.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0823/b975b58a0e5d8b3aeaa721ea950dedc5.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/15593815575.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/61731861769.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce586db050---90137295522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=circuit+diagram+worksheet+middle+schoolPDF 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_off0000b497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB497 14868 bytes
SHA-256: 46a27e016f7e6b42d6a145b5fc94a9cdb5270420e1c8eeaa91720b8d4dd51251
font_01_sfnt_off0000d9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 11020 bytes
SHA-256: 25c0e189098644bf54a220b66857856b48427e511587a2462afd9636c4d06dbb
font_02_sfnt_off0000f367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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