Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc90dec42bf00a9…

MALICIOUS

PDF

74.2 KB Created: 2021-09-18 02:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14dee67b261719c1fb7d661f2dd9180d SHA-1: 30070822de75e783b6af879e6d55e5ffbb93d132 SHA-256: 9fc90dec42bf00a9b0b76692d96e4b78efc5acf3c83c360051f77c5ce0dda80d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a malicious PDF designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://infrive.ru/uplcv?utm_term=mickey+royal+the+pimp+game+pdf
    • http://tuecpa.com/file_media/file_image/file/kawomuwurisiralomi.pdf
    • http://tagsu.com/attachments/fckattachments/file/27783210697.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161398740a6843---88550571092.pdf
    • http://ayurveda-shiatsu-nice.com/upload/files/sirevusopenemoli.pdf
    • http://besttailor.info/ckfinder/userfiles/files/wagoxir.pdf
    • https://saikekanglun.com/filespath/files/20210918054519.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/381334efa696e7602083a4470446e9ce/79152641117.pdf
    • https://www.meditech.cz/ckfinder/userfiles/files/78579266483.pdf
    • https://bold-iot.com/uploads/files/202109130647175161.pdf
    • http://bn-biz.com/userData/board/file/misivudelifunoxiwebos.pdf
    • http://ajitcoatings.com/uploads/wosopatidasule.pdf
    • https://agencement-menuiserie-var.fr/stockages/files/razobubogaguwewaras.pdf
    • http://taociren.com/upload/file/210904235217947002rbsu0pw4xtgy.pdf
    • https://procogs.com/FCKeditor/file/29170997822.pdf
    • http://bordahusfeldolgozo.hu/editor_up/sagopufagogu.pdf
    • http://antichigelsi.it/userfiles/files/80741011330.pdf
    • https://faktxeber.com/resimler/files/gobowugurerip.pdf
    • https://hongmao.tw/uploads/files/202109111531447202.pdf
    • http://jobsandhi.com/uploaded_files/userfiles/files/lidogotazo.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/e50a204373d3d3ea40fab50509a08a1c/gixobitobuneji.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133d62953edf---leminelupewelewutogarumif.pdf
    • http://myslizdrave.com/soubory/68508616348.pdf
    • http://iberia-ex.com/images/blog/file/bifozimawagajopifaro.pdf
    • http://jmyhship.com/uploadfile/files/64017767207.pdf
    • https://emenu.hu/editor_up/tawudadotexilibomepuzuxag.pdf
    • http://thevisionkharj.com/userfiles/files/pojaraxeba.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_off0000be47.bin
5c8e0073688a8ff8a9cec866e9dc6d27a15cf3b057dfae7694bea66ae6c702eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE47 16800 bytes
font_01_sfnt_off0000e95f.bin
8dea77a6d2dbd72183358c3d89fbf4c8cc33cac14119bc345f2442cc0e544a53
pdf-font-stream PDF embedded font (sfnt) at offset 0xE95F 10992 bytes
font_02_sfnt_off000102c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102C1 16792 bytes