Malicious PDF — malware analysis report

Static analysis result for SHA-256 e174c903e84359ff…

MALICIOUS

PDF

87.9 KB Created: 2021-09-01 11:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9bcce08d6e80e39e36bc6765089b4096 SHA-1: 3936c029e59535512e43f812cfa802be3acca948 SHA-256: e174c903e84359ffc18e10898a790d4758dc1cd59682ff313097a3e65393cc04
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages, indicating a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06911b73e---zixewedegokoxowumikadabaz.pdf In PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/iluinlg8713j6i7oipth27i7fg/92954877767.pdfIn PDF document text
    • http://leton.pl/userfiles/file/46703032087.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/xuguwejijexonozaxivamapim.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a39ba4a64bff2b86229f3399dadc975b/resapizifepobolal.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/monuxukelegipevited.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/56070248572.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1cba537a4---71004673539.pdfIn PDF document text
    • http://yulintimber.cn/d/files/lufapiweriwonameget.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/53544467863.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160feadd5dd84b---17748617923.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/perofafimafojewak.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/zadidije.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/3867778106.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/geginedixunetunekanur.pdfIn PDF document text
    • https://cape-electronics.com/media/file/28552145296.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/94671374976.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/l8bfrj4njo07qn0h49aiquei1q/52947079978.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/73786079532.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7162c0733---42673557825.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/rederuvibuvutazaginujunid.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/vilunurura.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c22b0053c---18513859076.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210714015724.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/11361655653.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6130a1c5e6---fajir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=isosceles+equilateral+and+scalenePDF 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_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 10560 bytes
SHA-256: 6612d704f49d3aeeff258219271a0ff492399a5921c5ce5b4a9fd8067c077b8d
font_01_sfnt_off00010862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10862 18588 bytes
SHA-256: 7205fc05e790694d1c9c1b47448cc7db7faa8b3a52834582124ff1cae1f762ee
font_02_sfnt_off00013944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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