Malicious PDF — malware analysis report

Static analysis result for SHA-256 274bb54a0309e63a…

MALICIOUS

PDF

78.9 KB Created: 2021-09-17 16:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a26b3a05ad0d685c54f1a3610292dbbc SHA-1: 4be707654b1a535cec60a1224245b159dea5b652 SHA-256: 274bb54a0309e63ad4a411df45bc1945e9d300bdf3a2236f638413251fd0ef33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://philabc.ru/uplcv?utm_term=safe+search+filter+chrome PDF link annotation
    • https://cplastik.eu/data/cms/file/73375655649.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/58687241078.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea83c6adb7---51402748785.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/pefozunebigemen.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16134b8b6f1ecf---vumigivunakekifalufesaves.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/zejexuvo.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/9297785532.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/10361568682.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-5/20210905080809879975.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/dedat.pdfIn PDF document text
    • http://safarang.com/basefile/files/97388260173.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/zipodoxubedoli.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/1qn2r9do8hm605a40412t2c0oq/70544915860.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/64032504651.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/14990377094.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6e0481eda---69907223870.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/kuterovodisemure.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/15155843405.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/luvujad.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/44036786981.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/98807042095.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/19987533282.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/50874116113.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_off0000d15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15F 17228 bytes
SHA-256: a84ecf457f645212177f8d176f66b6785753ba0f2d4330887b2a35602a84b60a
font_01_sfnt_off0000fe50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE50 10572 bytes
SHA-256: 60e8b29624fbe79949b7009babaced5990edcb7fea47b585319d1364fec20abf
font_02_sfnt_off0001166c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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