Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f14d9d128e5688…

MALICIOUS

PDF

77.4 KB Created: 2021-07-22 19:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5fb078b4d0dd5c1784a20992453e1f79 SHA-1: 5276b8e1760cb2a6542ba87250fc4c457ac5be34 SHA-256: f9f14d9d128e5688b6b9a229344b082531090bf9d21365d971295311142d27d9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers confirm its malicious nature, likely serving as a lure for phishing or malware delivery. The file's structure and embedded links suggest an attempt to exploit user trust by directing them to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/71575127245.pdf In PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/tubenusobumovemaza.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/gujipawogur.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3a89e0609ecab91e322b715c223bf5a2/53082161920.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/sms37btd72q9fdf1a9larlh3c9/82963517479.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210515194855_1025438061.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/58038962413.pdfIn PDF document text
    • https://wrd13.com/force/file/bokinuvafikav.pdfIn PDF document text
    • http://cichanski.com/Upload/file/65868655761.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160efd2c20f27b---xofegusigozawuvif.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/25664182045.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160e067fbdbd38---36095892023.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bd24488f9fa---57099143704.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d4b68d2b2---lisugilubevazisod.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/6c9d7afede525f58080017627251e7c5/80543094761.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/ea2410cfb1e0cd94bfdb44e05a86a088/birinefugorawusixesumu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed984a460db---66185919622.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/wugupagifelitazu.pdfIn PDF document text
    • http://unsersohn.ch/images/file/77491145241.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/tawaguzerawetob.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/dnqdjlgs6mgapvgheudb6n7ml3/80270330073.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/27109385205.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/piniwa.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/78569680940.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/navowivu.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/fs28nfnfibck1pmg37gmrpjmq7/7677495646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=law+and+order+season+7PDF link annotation
    • 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_off0000cce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE4 10100 bytes
SHA-256: 63473b53dff6882c0a6084ff451242988b7f6f0e04faa091920843095d59aaf4
font_01_sfnt_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAA 16556 bytes
SHA-256: 5ebe3a9fbfa8f8880155c6a9b767d6a9514af711cf1116b4d035f55064ab8b9e