Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11799dfc84c4182…

MALICIOUS

PDF

82.0 KB Created: 2021-09-23 01:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6cc7d2ec3cf4811d5b0b5dfec80e5f4d SHA-1: 04511ad4c9fc5a973d97995373bd7a505f1a0fde SHA-256: c11799dfc84c4182c593484fb00f5e0cbba68a3cce33035b99ff4f13ab4a053d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external websites and some are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is unreadable, but the heuristic firings and URL analysis confirm its function as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drafthe.ru/uplcv?utm_term=dragon+ball+saga+apk PDF link annotation
    • https://sportuna.be/ckfinder/userfiles/files/ninekotijonurebelisiwi.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/wegevemafuxupupabadaz.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/zedijiwinasi.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/74628104783.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/bomeladagufitazufedab.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/botufobakatimene.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/71928935170.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/dozisivapunofakurowasejo.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/47676745626.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149906e69938---68239959312.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/43888436390.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/bevdihvhdgo6dbf7jd9c4n77ab/sewibenuzivewepezi.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613230670a54e---tomazituvesemulu.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/tasoxupenifunudam.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9565c1fb2---dunasumupimusukapefi.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/febepilasukusug.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dc52aa869---75368072412.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/93454603422.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/davafud.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/54906195392.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/gabibufifomanofokuda.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/rilegabukil.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_off0000dce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 17900 bytes
SHA-256: e4b0bcac6c6f14ecc2a3f67a048059d24558cfa1a82670f6cdfa2f6a4f7615e2
font_02_sfnt_off00012315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12315 10336 bytes
SHA-256: d380c65be5dfcf69101cb64bdb6b4fffe99ca38f32a66dab4d205f88f7633e18