Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a94605a9709090…

MALICIOUS

PDF

88.2 KB Created: 2021-09-02 07:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3811068975f8cf8213ec6e20fe5f23e4 SHA-1: e8dc20657d7afcd1eeb882ad898433d3c09e57b5 SHA-256: 55a94605a970909088ff08fac93f449680aaa9779b8d9436f098d4fc4d348825
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URI links and link farm heuristics supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://oniceh.ru/uplcv?utm_term=rave+master+fanfiction PDF link annotation
    • https://global-product.org/CKEdit/upload/files/tedobi.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/93368135075.pdfIn PDF document text
    • http://allasclub.com/campannas/file/zexisinoxux.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/ludazit.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/70104105273.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/9751847870.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfded9897e---58655473448.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/97751815023.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9061ada56.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/jh2gebbmf4l0gncnk037nj469u/33868783759.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/zivijuxokadudezomediwoz.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/wenojegugedirotopavivom.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/99876608481.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/dorerurasuf.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/87383207812.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/j5a2347ssfthmke5c2g72d82oq/8774741431.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13e80d24f6---riwavetonidomebetedu.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210616132200_5escgg.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/14b99c2cee9539b19e31f5ad7eec0949/85000405221.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/42947427904.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/rewujigepakuke.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/97565133063.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///tizozutunugufedokisaze.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/qr91kd0lemqug68164adstf671/bazamepawubosem.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903e1ad5c9d---ladiziboz.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_off0000f609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 17196 bytes
SHA-256: 5dd4c9fefd907fcb4cf34781c86ce4ec500802745d8dcab2c42517e9e25972a5
font_01_sfnt_off000121ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EA 10560 bytes
SHA-256: 707b64dbd711aaa6fe88e88312aa32f49f824df8ca1ff4303d2e2ea2761ffcb6
font_02_sfnt_off00013a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1