Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d0971f8c6901ae…

MALICIOUS

PDF

106.5 KB Created: 2021-09-05 19:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e16b7f74d5f689ff64f820c96b37ec4 SHA-1: bed26e6f83b2b29387a903e529e59ac4bf9b5415 SHA-256: 28d0971f8c6901ae45f9a9b8a2d92c2669e1142f5dab002163f5ecbce06ffec5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://accronline.com/userfiles/file/25135741077.pdf In PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/nuvcfj6fg7phr6bphveb5rhrcj/suzegadagikikaba.pdfIn PDF document text
    • https://codecs.roimages/file/muforarikeletoxepeguxis.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210624034921_8tms7v.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/904as60jn5n4hf49qimvtgped2/94325752758.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/vigoxokavatapejuwugodixid.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161105c5839769---xosezulolazeperi.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qsk8nk4e3hpht1h4ip61mdt36j/vomatapusigabunoxovesu.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/5a305fbaca562fb51495be43bcc91406/jonenuviwokoxoguwuxe.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/10644440737.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/894bce1b6c7a10b0fa0742a43d763846/87611721511.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/vewuxunawimer.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/e0f536484590dd3e7ee402440ce9f5eb/50814991182.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/48778813693.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/96309711126.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ttgaed662iqv6bgil5o3p7coib/mijexemugom.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/80356577124.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/16028575094.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/34875248732.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/24882815521.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d524b240f4---xulenifalekobigujimasuso.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/tolefipimijozufiroxixo.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/j0oer7vfp6dmutth426loiu98v/gajokajito.pdfIn PDF document text
    • http://billsky.ee/files/file/43597895830.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c14cd2a7b3a---60370801711.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/bf8079134da83bb7f2194ad503fc3140/90345234912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=horus+heresy+book+vii+inferno+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_off000136b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC9 10792 bytes
SHA-256: c6bb948f5030be2df22dc1f9746ed52ec23d8dc74138f234c678aea753e94da5
font_02_sfnt_off0001675a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1675A 20632 bytes
SHA-256: 7a75738c3efcd376fbb5028ed1bc89428b0d9a96a231216ae22e631f9ff739a6

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