Malicious PDF — malware analysis report

Static analysis result for SHA-256 7241bb79da2575b7…

MALICIOUS

PDF

166.4 KB Created: 2021-07-20 09:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 49e7e7103ff5be0fb8162b4f0204aefa SHA-1: 4fe34c6bcea66e6c732983a5817f6bbae4c88621 SHA-256: 7241bb79da2575b791a67ba20532d49368f379063d2d5424b5088e2d3e2e145a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9713

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://angkalaris.com/contents//files/supatepo.pdf In PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/63944635844.pdfIn PDF document text
    • https://tessuno.com/upload/files/60decd751b2da.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/592653f4b052d376dd6c549497460618/kumisiruki.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/ff4f920446b429f7f4b50e0bdef85901/kuzovovararutexobobo.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160987fd6ee766---11477390878.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/87524795638.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddc305da29---zuxapamobor.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/4abf8b9c9437e3e71c3929386fe539c5/seluwaravuzepami.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608695bddfd43---dimavug.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e90e75ed2de---fuvagapidirokij.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/puvinibo.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ras31bbnmkdovv7suu30csmqqf/1116877327.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/faxisagusafufu.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e22f6a5f2fc---guburakizozifitikaken.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/f969d5e8b3f93edcee4ab8a9230132cc/xasitiburodo.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4b02a75d8---vovamipivuvifizezenenuwu.pdfIn PDF document text
    • https://nada70.org/userfiles/file/lidojuboladijojulabido.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/9efe6ffc5e66497bf4d0881634936675/82521869504.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/75tvp43re49mk9hn5d7multtm5/dexazuwizunakaxanu.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/i1244g0jqo6lmgmhe1mdglbc73/42907650981.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/forobivizifenafem.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/lp9f35e10f81v7jukugte5ohhi/70594383724.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/52272760736.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/4htj5kna4oo07tarn3llp655an/bavurufopafezafotunipuj.pdfIn PDF document text
    • https://edbcagliari.it/file/tapexirutuvoxufewavuwelal.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/94438436501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=elephant+quest+gamePDF 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_off00022f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22F94 10616 bytes
SHA-256: 731f82dedf740025f9ea6726b1e988e367408bb86d6c993d48cad8ec96015a8c
font_01_sfnt_off0002475d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2475D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00025f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25F6F 17164 bytes
SHA-256: a88b89dd3d7aec3361509c4dbcd0fc9ff4799a13db1d450451bc65c6d019ad3c

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