Malicious PDF — malware analysis report

Static analysis result for SHA-256 70bf851abde6ef94…

MALICIOUS

PDF

94.3 KB Created: 2021-09-09 02:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a481ef97f0956a29af3906e9008a906c SHA-1: 6ffd0e9943cad742238a5316f297f812ac0afffe SHA-256: 70bf851abde6ef943fe21be4e731036f12c721c997c4201ce7973276d1374ded
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nomylo.ru/uplcv?utm_term=gta+san+andreas+all+cheats+download PDF link annotation
    • http://obkladlazby.cz/userfiles/file/92057179355.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/tudof.pdfIn PDF document text
    • https://lecachet.fr/docs/files/zulesijuminoxovuginebud.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/24123833404.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/56652163319.pdfIn PDF document text
    • http://metallpress.ru/files/gobewavelubebasip.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/82263698620.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356ade1d1fd---79556781268.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/nedopadi.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/segoluvakobitizas.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/pujebofotujijedozugebo.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/68961707996.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/56038972268.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/magiguvajo.pdfIn PDF document text
    • http://ladna.pl/user_images/file/vikopema.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/mt93vk1lu5ja47tujhin3ks9o6/fezinogefulol.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/36922192767.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/jimowepulogugamo.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/40148415010.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/2113239205.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613926dfb03d0---sitebotupezawoweriza.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/b684667ba26190b330a606386271bd2d/pomonu.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/fagopodan.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/zuxaro.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/woxurukivupolepi.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_off00010b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001235d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235D 10500 bytes
SHA-256: f506011d83ffc751946d474036efc580245ab1a2fcfc70ed1f0a9229117b1208
font_02_sfnt_off00013b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B46 18404 bytes
SHA-256: 10544a03f19be3d8559c879866678abf2544048815e56a9dd07efda23f06b037

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