Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72c85cd12503545…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 00:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7bb88016b7853c762f346e54ba979d32 SHA-1: d42b6f7b8196454802109afd22ae00333cb0ebbb SHA-256: e72c85cd12503545ea5d657ddfbe85dedf1305595fa03c488cd70ef2250e49f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and link farms, suggesting a phishing or malware distribution campaign. The file's structure and the presence of external links indicate it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://smidgel.ru/uplcv?utm_term=pallant+2010+spss+survival+manual PDF link annotation
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/gabej.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/79054950155.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec5768bcbe---6518338973.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/48373423183.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b64c877d8ac---69662734298.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/1383017900.pdfIn PDF document text
    • https://kapokcmassage.com/uploads//files/202108121020543194.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727518a10ea---20646985468.pdfIn PDF document text
    • http://minhanh.com/files/46450916720.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/mulugirudomojelemoje.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/jepupene.pdfIn PDF document text
    • http://fxmeat.com/upload/file/f4c64c35387b1fd7470f49bee3354cdc.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e3a33d6a5bbf8f08025634bfaf710976/zedukuzumokusuduzatuboba.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/66639871348.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab52d744c7a---wupumabomagugipujakijix.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/xenuvetam.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/25967504958.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098aa9d65586---95582176156.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b67a7e1053d---kenefiximakisinaw.pdfIn PDF document text
    • https://susta.vn/userfiles/file/72704901087.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/sutogiware.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/limulerokumidunudavu.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/76642795842.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_off0000d294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA6 17432 bytes
SHA-256: 41306f096aabc46855006e8f6d11ac34d80eacc64fe4ffdead891a844ae9000e
font_02_sfnt_off0001182b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182B 10620 bytes
SHA-256: 652684b7daba875ff0cd8e86710303f150ba9382bfed799e93e2ad7de86c3362

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