Malicious PDF — malware analysis report

Static analysis result for SHA-256 800b2b2efcb8a592…

MALICIOUS

PDF

90.4 KB Created: 2021-09-16 21:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 978b7c6083b436d56aafb818326ba3fc SHA-1: 23b4f4490289a77277e9969328cb30ef52a7c361 SHA-256: 800b2b2efcb8a592356b22170ea79190411dca5ccf4a3d61ef8d74bfee1dc4b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, including compromised WordPress uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=fake+gps+setting PDF link annotation
    • http://analhospital.net/file/files/rimuma.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/780186642.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/70140714996.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/refifo.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/46601892648.pdfIn PDF document text
    • http://xtra360.net/campannas/file/20430938907.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/denukul.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/papavozozusak.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/mejexolusipabikipeke.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/luvozekesinozufavitev.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142577570031---koronogegonovanemiwiz.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/6b98c9f16b4f1c7ce3fbebc5a0879370/96168099631.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/nexumoposadiregaxutup.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/supowobilemolalexefo.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/58676959744.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/forotubotupamagoxoko.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161413a40b5df0---xizadaxuwesilumum.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614279dc98884---16773397803.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/vupesoradazekomopetuxa.pdfIn PDF document text
    • http://sunway.me/uploads/file/10115259349.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/92961356412.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/98817032949.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/0f5402215291510fa9c1308c6bccd436/pafokijibexowa.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_off0000f987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF987 10232 bytes
SHA-256: 24304627343370bc7cdeb5199f7bd05a43111f829facbd51befbd8007b78419e
font_01_sfnt_off000110a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A4 20008 bytes
SHA-256: 3e29102ef9d26d64145a8785df502fb0d7856a84ecb679e930f03c8fdb08aa8a
font_02_sfnt_off0001442f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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