Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff65040ae7a03df…

MALICIOUS

PDF

92.5 KB Created: 2021-09-13 11:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5e082274ccdf52676f7dde9d6c3b8d08 SHA-1: 14e6f25c3d1faf7a8d95b65b8e38d71766c06b5e SHA-256: 9ff65040ae7a03df547e126d598e129566b918930da71d732c58f2aad6e2e2d1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to lure users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://archism.ru/uplcv?utm_term=one+piece+adventure+of+nebulandia+watch+online PDF link annotation
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/gofimikodoxogajotezu.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/35307881242.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/wepakuzeb.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/fupenetug.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/a5e9cc38af3075078dff29d74b80c691/folubakoxupojapuwifida.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/98608596437.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/51971293175.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/66093200409.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/zipafononugamalakagiziku.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/27449345574.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/64548135351.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/96342697744.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b5e5a2f5c1566376399598b92b04cc47/49866779890.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631354583jurexutesiv.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/puzenomubufuxuzasiduxif.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/29100556623.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5629e1a1e---nezowolopufutifi.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/nanumukosujatirefo.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/29674476427.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/30760829235.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/bhq23hrkb1h8orpjbmf58h8at0/romitogoxunoja.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/niberivebojefiludobusegaw.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1541566886613ce65d6b322.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210912204505.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/19cccd504f9557c8f0058722c697836a/xajoroderabununexubadiduk.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/wememaxulajutewupave.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bc8528172---29018934111.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_off0001035f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 18060 bytes
SHA-256: dae2efc8282a89aba08022c655df924c8c64c166824802ac13e8ea1a78a69697
font_01_sfnt_off00013279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13279 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A90 10968 bytes
SHA-256: c34775641c856cc98cb1b92b86d0f91452f3c794668269f0766a99b1943ccdd9