Malicious PDF — malware analysis report

Static analysis result for SHA-256 88135bf0c433e7fd…

MALICIOUS

PDF

79.9 KB Created: 2021-09-05 17:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7afe1f054ce329c1cbc8ad7ba237ce89 SHA-1: f5cd211d832a0bfce1a2b020dd1e5e1365b8eb2d SHA-256: 88135bf0c433e7fd027095b0868e04c9ae944632e3a38c17c2578d8d07fcae10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the heuristic findings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=coleman+queen+airbed+cot+manual PDF link annotation
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b44bb23841---16537142854.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/44172854432.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/81373036248.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/593fb0b53c403bd1c08a4802d6da841c/bunutozul.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/tsrvjllp4ihn6k06iq3o0k9nqr/37628931601.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/96210402789.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/lovepafuvifigukir.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/48720686176.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/81361502592.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/tiser.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/90566309333.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/93356501546.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/kmoer1u3miepkpnrq5q9dko4li/77752246754.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/5562857652.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/livalu.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/ruwasufoguforif.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/tufirinisok.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/57964018889.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/bisibogagodorobinage.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/zozetamevagujo.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/28562654673.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/47355109677.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/55090968480.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///83288322293.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_off0000d658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD658 10780 bytes
SHA-256: e054c4855c4640b5d216bed15f3dea5f56bb5b00de9dc72ca4b3873ea5a38d27
font_01_sfnt_off0000eee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE4 16668 bytes
SHA-256: c92df129521570d52833b534276bcb3fded9f29220077b36bf22b39adbf84e9b
font_02_sfnt_off000119b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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