Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdcf144d5bdad516…

MALICIOUS

PDF

85.7 KB Created: 2021-09-05 19:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1fa7c9e79255c75e90550d728c116aed SHA-1: d9dc7211d584e61939d0121be06c3430d8bb1c7c SHA-256: fdcf144d5bdad5165a9b4470122dfe84f302d00fcf3bdeb2a232d80dc3f4e396
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to compromised websites. The embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. No scripts were extracted, but the PDF structure itself is used to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=florida+department+of+corrections+visitation+form+pdf PDF link annotation
    • https://www.passion-rnd.com/upfile/files/2021/08/10/45017615451.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/82780427206.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/wowirumaluxatusifozu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612a60d0afdba---80796773206.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd92f373f42---84183318286.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e74f1890e---luwuzukewafu.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/3808283780.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210619165132883.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/32621989315.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090f4d671e05---gedovotur.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/7425383471.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/rurixa.pdfIn PDF document text
    • http://sushi-belovo.ru/files/60355371927.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/rawelonedobeluwojubinurak.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/44261756613.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/0fd23811471b108886bf454edfa39c05/zofugunafinogoma.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/76641983121.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/780fd3acb45f93a4498f14f95a34bf38/kojezejefima.pdfIn PDF document text
    • https://www.dars.bg/ckfinder/userfiles/files/57347440081.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202162562203939.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/43768842124.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210806004949_s8fbth.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/53239395227.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_off0000e9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B8 10824 bytes
SHA-256: a3a4da2266bfc47457f56f63eca3fe656376d4444b728ae72426535db24569c6
font_01_sfnt_off000102a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB5 17656 bytes
SHA-256: deaec2043af7ca87842a026ca0f0a8e7ed009dcaf7f9d3f68fd335f1ebff84e4

Open this report in the interactive analyzer, or submit your own file for analysis.