Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73f5f72c8368edf…

MALICIOUS

PDF

79.7 KB Created: 2021-09-15 17:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8be236609780930b6051fe1f9c1404cc SHA-1: e7736a5de2e8166b6660350d48c793667724f3b3 SHA-256: d73f5f72c8368edff7ce601079bbade8c73fadf9e86385030e5c35fa8b1ddb3d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The embedded URLs and the overall structure suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://pravkniga.ru/files/userfiles/files/wivinogimakobonekeneni.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/cmqct4qdbmbaorje7vcte5sc9b/97877424439.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/tegupetunetoj.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/51364279245.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/rolopazefisov.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/teguguniwede.pdfIn PDF document text
    • http://pnalog.ru/images/file/vapelupekuf.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b764d36448---76691727547.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c068112b4---23207244423.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/53895007012.pdfIn PDF document text
    • http://etre-belle.su/images/file/15985946606.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406f976f8fa---gitilefadekumabojimiferi.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/bepowikanafijobube.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/wulisop.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/5254836348.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/bubitotovoritivarer.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/23743013809.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/fusazigazebem.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/42797706073.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/338b686b6a7a8a0900ee8f8a91b576e2/74672233971.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202194153133227.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/butisawofatemuba.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/22168438492.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/metob.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/19028942917.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/fewog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=android+phone+keeps+locking+itselfPDF 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_off0000d251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD251 10812 bytes
SHA-256: 3c6c022b2cbf2fddd45b2d508e5cdb0d4f08fd6bc5c2399c039c656551bd86f5
font_01_sfnt_off0000eafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001030c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030C 18616 bytes
SHA-256: d94076414d28ac7a51fb5fcc80939ba89d928d949d2f85f11cc30da607bcc82c

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