Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11e29182b1b50bc…

MALICIOUS

PDF

73.7 KB Created: 2021-09-27 18:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42a49bfe8e5cc8f2b68339db5fb9b2ae SHA-1: a07799829520e040d7ef2e7a8825d33026fa5797 SHA-256: d11e29182b1b50bc7bf89f0fb7a5405105c35f6698a81b14438b1559f4f530b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristics indicate a pattern of SEO manipulation or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://inwebjor.ru/uplcv?utm_term=how+to+create+a+simple+app+in+android+studio
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/65515438028.pdf
    • http://netmode.net/app/webroot/uploads/files/nemelatofobusagugiz.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e47bca8e28---90545293057.pdf
    • http://yoron.net/up/files/jobikokamupom.pdf
    • http://iglozawiercie.pl/zdjecia/file/kokodedababosi.pdf
    • https://dodatkireklamowe.pl/web/uploads/files/xaraneguzakororimavem.pdf
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/kitezovip.pdf
    • https://happyfun.tw/uploads/files/202109080328101853.pdf
    • https://fontan-montag.ru/img/upload/bedowodexa.pdf
    • https://globaldreamindia.com/webcms/file/xudogaxuvefedole.pdf
    • http://placc.info/up_image/72654773079.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3ebd51c38---21444238714.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fffe1af002---duwibolikifabokisolidak.pdf
    • https://aucordechasse.fr/vosImages/pijekozolunotigalagogip.pdf
    • http://netinflux.net/userfiles/file/joguduluvofavi.pdf
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/45591420789.pdf
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/nogobekukojevawekem.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8go7i125ufstnl2ggq1s4k6ho4/38685236083.pdf
    • http://hkwwta.org/userfiles/kokipozefa.pdf
    • http://sin-hua.org/userfiles/74466269766.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/fe54eca69541ee1ef13e079f2f6f8f3f/45652689348.pdf
    • http://jlicentral.com/images/authors/file/34062366792.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/6130403765c7588f337183fb72af846e/33505542890.pdf
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/18837507617.pdf
    • http://ricarda-allegra.de/userfiles/file/99400502065.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9ad.bin
b80462169f3bc9698b6444ae9976663b1454cc6b0c60bbffcfa2a92e39844b6c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AD 17820 bytes
font_01_sfnt_off0000e788.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 16792 bytes
font_02_sfnt_off0000ff9f.bin
658eb9b560a2c4ed08f0fdd9503bec74ae3005c45ba6214837bad71a4ec11be1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 10852 bytes