Malicious PDF — malware analysis report

Static analysis result for SHA-256 239f03f93b97b034…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 20:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 667ba68c95c6f3832e8450425a9fbf55 SHA-1: 5562dd128f894b4334fd7a6db4e4798b62659f16 SHA-256: 239f03f93b97b03481d4190e82d91a583157b054b2199f5f1a049f6d1e56f08a
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically highlights the use of compromised upload storage for hosting PDF files, suggesting a tactic to disguise malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://iamsong.vn/uploads/files/nesapurakelozuzotoma.pdf In PDF document text
    • http://agriturismofattorialucciano.com/ckfinder/userfiles/files/nonikutuliripika.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/vorixobamejefidutanabumu.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/08e0ef54e082e17b6c2d3df4b563506e/xebifumuropad.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/xuwagox.pdfIn PDF document text
    • http://boxethai38.com/upload/file/watokuvi.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/b2ccf4204f84863d2fe1b102e9ba6864/bamuvixux.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/vewukogutolef.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d9060740a---98428655320.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/puvovipiwefowogevarit.pdfIn PDF document text
    • https://sarahgpl.com/userfiles/file/vuxorez.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b519c00c0---lejopozoxefaxuwewewinibaf.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/80858314441.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/zetirevos.pdfIn PDF document text
    • https://hiroyoung.com/data/files/30014226249.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/21cb3cbec5fa5166492a853e1ef1ce77/13124011199.pdfIn PDF document text
    • https://actorconseil.com/files/file/85710470254.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/0c26f84b640b23eefbb42d560a7b979c/wujoxiverotemugodisis.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/fefekorifokifesukifut.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/f3f65ff4b3e9db1f7c93c84cce93c222/41265531984.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3b089e1fce5c0bba38feb0b05e1ce607/fetarubovolaxapudijujujuk.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/feuun7vg3uq0ogfl6lf4slhmmf/52369036481.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/gomiza.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/52872147940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=patient+flow+chart+in+hospitalPDF 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_off0000d99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B6 10664 bytes
SHA-256: 363272ba99a22dd6dbe8d3fdb7782ad458362d26293a2b24bca9e4272b599a0f
font_02_sfnt_off00010a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A25 17408 bytes
SHA-256: aeef14b5895ecbe386121018f376b4e492fab1fd70cd73a76324f137870a521b

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