Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ebd6601890398f3…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 10:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7d2299a395fe158839b76aa4e1a4871f SHA-1: ccf7bcbb70d4beddbed4d767a7a886a4ebc9d843 SHA-256: 2ebd6601890398f37f6edd2798761fce6e49f53ca0a7e8cba5b48682dcdf3f22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. 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 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=bonaparte+crossing+the+rhine+fiddle+pdf PDF link annotation
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/lovenamida.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/woperabime.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/gavekezuvixuwororud.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/kudegibezarasafimizepali.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160749700735cc---jaxudabikaxuwamun.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a306ea72631---2054785784.pdfIn PDF document text
    • https://zhansq.cn/upload/file/55755414461.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/7977747090.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/berekuzamaxilolobixe.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/79343647042.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/3cffe4ff64a29b71c4ccfe73b5b9cc60/kaxiviniwekirar.pdfIn PDF document text
    • http://cycling-software.com/files/file/45273683397.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/22852919735.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/329b6b5f16d4ce46aeab61940eeac8e8/81325829142.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/40288423484.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/kilateko.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/76947291702.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/sulix.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/dewekenitedis.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/k3ou48uglp2ko16nr01uh0t9im/vubidufuxurikitususivem.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160f8551c17282---371190816.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/j4g1n55teth4ver6p511100tgr/tujonewuteripojudej.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_off0000d62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62B 19036 bytes
SHA-256: 6df0c3a80254d5e2c1415b5a7459ae971af77b288b7963d910dc20bcbd1632ba
font_01_sfnt_off000108b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 10952 bytes
SHA-256: 29b3490716d5a1d4bbb39036f15d38dd8d62be0109b4356d68f536feef183962
font_02_sfnt_off000121d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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