Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa62a843d0354efe…

MALICIOUS

PDF

81.5 KB Created: 2021-08-16 21:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2ab0f6a43bd917e565e7e7b6d3545a30 SHA-1: 81a6ffd2da72fd57a4e368a01c222930e340cd74 SHA-256: aa62a843d0354efe97468d68d805d2a3aba2282fcffdce1fc70dae138cedadd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to phishing or malware sites. The PDF structure itself appears to be a lure, with the document body being unreadable binary data, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=what+is+the+order+of+adjectives+in+french PDF link annotation
    • http://sangiorgioautoservizi.com/userfiles/files/75084737473.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/39338109155.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/sewixuroxenavidalanifema.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/3fuakf0bths6o7lj6ia2m3o232/17114337306.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/retudebunukebufe.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbffab895d---88018052228.pdfIn PDF document text
    • http://dejede.com/userfiles/file/30452260957.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/30005903044.pdfIn PDF document text
    • http://cortabellanews.com/userimages/varadeduz.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a17817931---99478253543.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/34380466663.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/95027439166.pdfIn PDF document text
    • https://theurbanthinktank.com/files/fazawabawo.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/64843d2a4443f27e37608bc80304fd48/gisatotumemetamibafinek.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/25081270542.pdfIn PDF document text
    • https://aedwea.com/upload/foto/defozugofofapirajebegat.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/b4ff93f33e7c41754cb18c43f06475a7/rovovisojebagolokewojolo.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079952c57f60---dafewukofu.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/xeximedizolosof.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/198d76ff3b559e6f8969886cc7eb3d6c/75549157535.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/xijaxitizebido.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/2cb2808c4fb4ccf8511ca7575b9a6332/94300130417.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d6f06b5d3---73002898392.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_off0000d9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 10716 bytes
SHA-256: eeb5edd1883e6000d8d27895c55d7905c7825e868679076909d0848a8cf66e60
font_01_sfnt_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 17560 bytes
SHA-256: 31f54ea02fc75362943fba29b230055e4f47b6ff7e96f56eadcc2980a98b64ac
font_02_sfnt_off00011e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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