Malicious PDF — malware analysis report

Static analysis result for SHA-256 20aaeebfa0f77c3a…

MALICIOUS

PDF

147.8 KB Created: 2021-09-20 02:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 74510938001d5aa13059fd409817f968 SHA-1: 54501a192b2f3be2f3d92a5768fd63d75af60625 SHA-256: 20aaeebfa0f77c3a8efd4e2ea732d2bcbcaf130cf5470e514179c92e35db0090
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, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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=download+data+structures+and+algorithms+made+easy+pdf PDF link annotation
    • http://fxlcd.com/upload/file/37256154841.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/wadumojav.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/f6abb8e5c8b84abc2c42bec91478fae7/46797934136.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/dewikoxofikidelujajif.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/fipugawoxupuza.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/44843986808.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/23327820088.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/29122987170.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/97210707250.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/bozebu.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091719554173499.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/tidajutemonavugaripawap.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/15869008712.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/88309697132.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/bodewepirawis.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/muzafovazadodudetikep.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/kelabipisut.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/59448937851.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305976b92f2---98685396572.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306f88d0b1a---kajobizidukadasa.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/97680833079.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210903_53E4487F07A5163D.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/30999913969.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/9bf49b31e3ff70d2324013f4b02d5298/4782943968.pdfIn PDF document text
    • http://pileki.com/imgup/file/gideborezoxemafebumaxid.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_off0001d026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001e838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E838 22720 bytes
SHA-256: 93db164d7a9a6fca768ee222cbce2aa2cb9e69525de48907aa26391bd6b2058d
font_02_sfnt_off000224b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x224B0 11368 bytes
SHA-256: 45bf6b2cac0d14ce8ee82acc2b03f2a9b835dc87fca20ea1173540d13baea746

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