Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff55f4fb69b33b8…

MALICIOUS

PDF

71.7 KB Created: 2021-10-04 01:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a7994ef1146f919eb8e9c7e636230fc4 SHA-1: 4ac7c04918e2dcf9ba9a1d9dfcfa432d3f13142e SHA-256: dff55f4fb69b33b87181915259cb6cdefc00f697d45ec4769616c835c9756e51
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, forming a link farm. The presence of embedded JavaScript and a high ML classifier score indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=tagging+pdf+documents PDF link annotation
    • https://verner.lt/images/files/ruzad.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/zagepojedisapevupe.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614984f884659---semaxojane.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/75379955899.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/14308741288.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/7nhtio5ou339q3rfgc2bqc8a2i/fofapulabomizopagusi.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/58396582947.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/87360965179.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/sadup.pdfIn PDF document text
    • http://baove24h.org/upload/files/10093426677.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132f3346e169---58717436081.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///samefubobexosekefapemoso.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/sutopuvawimexujel.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/3413632736.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/sapip.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/22039858678.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159b0a4f3503---71573628328.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/suzodulidot.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/gosewe.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/rusadoxilejadegu.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/jubakigonukewadobeliga.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/13271072843.pdfIn PDF document text
    • https://rn62ug59c-to8.com/contents/files/4785886966.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/nisozarom.pdfIn PDF document text
    • https://tuyendung.vinaonegroup.net/upload/files/vuxanefikagebewov.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/62665329494.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_off0000b3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC10 17360 bytes
SHA-256: 6c25679b462e115d54e07a4166bfd8eb86ae6b55a58be9390e5cae84569df544
font_02_sfnt_off0000f886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 10880 bytes
SHA-256: f7f3ded0d054e40a0e543d500b39c58436d0ee0f447155a1b42451e8b62bbf83

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