Malicious PDF — malware analysis report

Static analysis result for SHA-256 d718f0c64df02553…

MALICIOUS

PDF

87.6 KB Created: 2021-09-10 11:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 84da3795eead04bc9c705edf24966c58 SHA-1: 04fb785a886b43a4bff0fe6511b05de0fe02b8fd SHA-256: d718f0c64df0255365d795547a4bd8757aedbdbd0c1aa77552ab657600ddf9bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which appear to be part of link farms or compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF format itself often implies JavaScript execution for redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://allytemp.ru/uplcv?utm_term=galileo+brecht+pdf PDF link annotation
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/betarixugirawuzawededet.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/xulelovemawukutef.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/kadesodo.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/25561551907.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/wukaroterotitoguf.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/garovofugavibu.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///retogeko.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/75572812603.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/pegonafoxevapawakup.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/xaverewit.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/83666822215.pdfIn PDF document text
    • http://bamor.org/userfiles/file/jixatogemewemabepevuxapi.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/41534996557.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/xupavexojemisola.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/kawaboluzijozekenem.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/21771269392.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613998adf102b---33493830905.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f454c77c4---70066695860.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/jazub.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613567026deac---bufapesew.pdfIn PDF document text
    • http://a899.net/userfiles/file/wegedurukibitije.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb89e8e54---7219052954.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/faborazile.pdfIn PDF document text
    • https://506hlapeta.com/files/file/wolegusugupexolireva.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/68621221587.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130278740fa7---42363396614.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/xelabifebijuku.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_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 19088 bytes
SHA-256: ed3f01f7e575ca32acaa4a6a9da5c761cf20a388f808ff1dd74a4959b97c46c3
font_01_sfnt_off00012085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12085 10624 bytes
SHA-256: eda3414405bfa2b3c5f920261c88167672e2906e3dd0c11acc58064b2436856b
font_02_sfnt_off000138b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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