Malicious PDF — malware analysis report

Static analysis result for SHA-256 e832af227cd9a8fa…

MALICIOUS

PDF

84.1 KB Created: 2021-09-03 03:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9985e43ca74ca2d98780327f0048d1bf SHA-1: 0deb6d94f47a4ccf270a0576bb7696fb2f51d411 SHA-256: e832af227cd9a8fa6ab956750075667c8eea9f68b69bf7d5f0cfd0eee5cfb43d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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 http://biomassasia.net/data_ed/userfiles/file/87744634237.pdf In PDF document text
    • http://chsjackets75.com/clients/a/ae/ae1e0d6431e3080ad3d3eb1024a27f31/File/bisikupi.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/7486054291.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210724181553_xf1lez.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/25781654944.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/redujidomabifotuzisojagon.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/wejuwulesosovonarenin.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6c0e97983---nuguvixolefikonojajireged.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/litosikinanedugavak.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/58894980149.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/33284207914.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/c57f3adeca95a888b9fb6a7a0e3154fb/baboduxuganasiragi.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/720dbdc1ff27c315d09bbf45cbdbbda7/duvidusisixarime.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/96083923226.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b8298636d---81950280463.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610eb9aaa00d6---8958434710.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/xotugefipis.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5da0e0fa9---19143462275.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8f236b222---41109744589.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5aec1be30a---karunasoxiwow.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/fulasatunire.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/63060751061.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/93340830848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=soil+erosion+essay+pdfPDF 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_off0000e4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BD 17608 bytes
SHA-256: 53af4be687eba2f3243632865d7f6bb89d0d2c749c6075f7bcd6b3582c5be0fb
font_01_sfnt_off00011291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA8 10580 bytes
SHA-256: ef057cac3d2eab47941d920ba0861fbba128b1eb3965996978a163ce26fe1506

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