Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6162ed3e1e2dc1…

MALICIOUS

PDF

97.0 KB Created: 2021-08-13 08:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d5f2600def7ebb9856e4554f9afb1810 SHA-1: 664d1c8701a70211fae3b31ca17efe05d072a222 SHA-256: bb6162ed3e1e2dc123afe7dc38eb1ecf71a564398ee22d353045274887e61cc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites hosted on disposable domains, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/ead0a6119c5fb3586bf04f7c4f6119a5/76699565802.pdf In PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/46714672178.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/o83kk5758umch6tktv744vensu/tuvepeduni.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/649e33f22c8c21b0e1e0a8359a9b09d6/tuvasezumogogevediraka.pdfIn PDF document text
    • http://air-con.ru/upload/files/wolexolidozope.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/f92a5be252832edee60e76cbee0fd539/winixex.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/79052782734.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/57134805744.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/damipupamexux.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d281531b1---pakominemovedesig.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee1ee5ed7---tuzenatexulofo.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/76701796768.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/lososuwosid.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/d5930430f8a5490c1df1197a6a05574e/pagoxozaketapa.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/sivix.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/vomoxowovifuju.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/07/27/55816845323.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaabe00b71---47718319614.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec2e4dff5f---fesazezorajelifadajewiz.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/57448122759.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/aep0t803g06mfne1j7k19svqft/62183572584.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/9cb20aadcd6b50c0869d5e6de4386bb2/90273114130.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/bubulafuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=hill+rom+hospital+bed+rentalPDF 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_off000112fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FA 10788 bytes
SHA-256: 0f5c07efda4bb3590650671bbe1cd3f1f7ad8a93cabeabb1e1b936ada2b20b43
font_01_sfnt_off00012b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4D 18700 bytes
SHA-256: 8cd1fff492a2dac8ef7048e677f68be9a68ddbde0cf32a56069746ea1747606a
font_02_sfnt_off00015d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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