Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd81386423150cf3…

MALICIOUS

PDF

70.9 KB Created: 2021-09-20 16:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 12805120a63181def78dd7516ab0c302 SHA-1: 2a04ed203600c1898c751bebe5a8067193b955e5 SHA-256: cd81386423150cf347f6344036cf2467d9a73dc75b14f9979356ea48b8d2991b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=ott+tamil+movies+list+2021 PDF link annotation
    • https://asiapharma.la/files/files/4334950537.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/gewasokibalepitojisoj.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/96507449635.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc127e06a2---86780975133.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/62254898340.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/18569795970.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/86176466663.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd882d6c2---29870789840.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/14657819344.pdfIn PDF document text
    • http://keitbg.com/images/files/24113674886.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b5cda90eb---sijufitisavolumajup.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/15134261267.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135afed068ae---pojevirawosirisa.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/60105070863.pdfIn PDF document text
    • https://digireg.at/upload/karunaloxopolunameb.pdfIn PDF document text
    • http://apismorava.eu/docs/39362072043.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613986235ee14---bimipa.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/94233646574.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/maxolidiso.pdfIn PDF document text
    • http://stonebreaker.at/25647145656.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/tanobifoguteripa.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/v6ki54ev598cg163p3skhjrkh4/76719000133.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210907051121.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/58765030758.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_off0000b741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB741 15188 bytes
SHA-256: f7844a31bd77a3e441d73be6f80084a27405d0fb467ec957e0362d602fd5b95e
font_01_sfnt_off0000ddfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF611 10448 bytes
SHA-256: f4de77802dd0567f53816c491d1ffceb3b2fb2e6c736a5a062af3342e46b4913