Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab63b8ebad071e8…

MALICIOUS

PDF

90.7 KB Created: 2021-07-31 15:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38a017708d642798789d179c850e53b4 SHA-1: 4a092153f5d1bf049d875209fc7aaa4884eb7d09 SHA-256: 9ab63b8ebad071e8c4081a75f1ea5e147f5c7cba2c7548eb85dff13ec43944e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest it's designed to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=hereditary+tamil+dubbed+hd+movie+download+tamilgun
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/316c7634d5ca8ccf7ef0e615ebea243c/rawipufu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071211edbe5a---nomasaw.pdf
    • http://www.naraihillgolf.com/admin/userfiles/file/lomojefotuvam.pdf
    • https://thefertilizerequipment.com/d/files/17743520337.pdf
    • https://footballsod.com/images/ck-uploads/files/61928131089.pdf
    • http://rocb-ap.org/file_media/file_image/file/ferekododurapivo.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/51088446612.pdf
    • http://screen.by/images/file/fejotuvuxifusabapiv.pdf
    • https://tennis94.fr/img/pics/files/9005027291.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/q4rnodddd63ouioc8dc6hm282h/91616378841.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/v3hp0ggke1nlln2t5lj5h9ve3i/62171706731.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/50203442810.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098baac62118---tebesunomifinuxufedonofuz.pdf
    • https://promobryansk.ru/userfiles/files/25608788534.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/32a89ab6bc83088344dc2160057fb224/56587764629.pdf
    • http://nakatka.com/files/file/78034650163.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d3dcc18b6---nujeruwexuni.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b34eae162a9---levojodizomiranifiraguse.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/1cc9d779ed4da8ae03e6b49341b90264/44196000211.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/d52a4af1b4a0fd09ebe6c41fb7e81536/vumemipelajukiwali.pdf
    • http://www.allatpatikapecs.hu/images/file/51272936800.pdf
    • https://contabil-fiscal.ro/mm/file/69873097966.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_off0000fa1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1F 16792 bytes
font_01_sfnt_off00011236.bin
76c37741f3e79c3eb0543f883313b5fa65f12f52740c512a8c302aa8e0ec6c2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11236 11024 bytes
font_02_sfnt_off00012b6a.bin
f8221d1b5f9d46d8d29c3587130c1481de5647b21f83b0387e325a9614792515
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6A 18724 bytes