Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a0ff31eb42b0f7…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 17:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 82d9cd818bfafad6273e7015e9feb651 SHA-1: e8322982dbf44d0ecf09be9c3cf36970903a8607 SHA-256: a4a0ff31eb42b0f7d8c8a01a3337ba4daa5e3adffe532ad17dea4037946fca50
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The 'Remote-Support Tool Lure' heuristic indicates the document's content likely instructs the user to install or connect with a remote support tool. While no scripts were directly extracted, the PDF structure and embedded links suggest it may exploit vulnerabilities or lead to the download of a second-stage payload, potentially using JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144e8309f235---82394039099.pdf In PDF document text
    • http://studiolegalezullo.eu/userfiles/files/derowukug.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/40217423274.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/fodagubonizimatidu.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/92100632896.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/lipusigute.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8446bee6d---xasupuvukipugimivaf.pdfIn PDF document text
    • https://ikima.fr/uploads/file/81058501239.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/wolibemug.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/5099361508.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/19210352278.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d642b622bd133622bdd76a29eca8116c/61152337969.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/debikezubevevazasejufo.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/galugiw.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161359ecfb2b6c---sepedefibime.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m0ncblmhrob053i2givv7kjh45/31503433799.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/62266995225.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/44272034793.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/epiqta9v0iatjj55q7tt7v8u1p/39260036427.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/zitesagujabazeseluwo.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/75001082795.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/gutetuzuwuxalem.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/94387061969.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/vadanawixupewe.pdfIn PDF document text
    • http://topflexsports.com/uploads/30312468026.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/88119230041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pc+screen+mirror+to+androidPDF link annotation
    • 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_off0000e1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 17644 bytes
SHA-256: 38f8d85494010a52f693be0e6cb8fb2baeaf2f1025879b8a5d746a2d71ce1c9c
font_02_sfnt_off00012758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12758 10488 bytes
SHA-256: 2d1f7bdbba244af1f96ddcc533f6b6d9b8b7c60a927ad66e3a3ca4cc94c05771

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