Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c3a98f6ce33404…

MALICIOUS

PDF

87.6 KB Created: 2021-08-23 18:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 421f807fc29092ab55ce57dab2d00db1 SHA-1: e8b3f0790e6ef1d4ca7dec44b96bd8f45e80261a SHA-256: 64c3a98f6ce334049740da57a3aaf11a70a36a369b6ed20a3f8f34f757b84342
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users to malicious content. The PDF structure and the nature of the embedded links suggest an attempt to exploit user trust for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://kuppersbusch-center.ru/uploads/files/36629067777.pdf In PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160882e2354d81---jolerefinideso.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/72563466522.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/cbf2b13ibjjcpnlvi44hhias4g/fadorimazukisenavo.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610af3bec9b77---80552079669.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/53569072114.pdfIn PDF document text
    • https://ivanamihic.com//files/53459589782.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/48u1b55s69v15jef30i77led9n/1046568368.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/91573cab76946753a86aca41e15caf9f/80074939501.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79ef361a5---61409220617.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/4hrc3cjp6hpvufe1tdonqcc6v7/29779195170.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/wapexa.pdfIn PDF document text
    • http://yuha.be/_files/file/15436943983.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/83827118752.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/68285236112.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/pghfan9o4judo42vo0d0d1gr7a/miwusolewubuligojukizara.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa057696d7---43637815830.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/xefozenalemifozozilese.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/66499363544.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/9g8it35a4urkcj3c1pc352tg07/wojekamodokolomebekutiki.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/78972939032.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160987a37a6cf9---nopabepufululelov.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/gasurogo.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/tanozuwodogazijij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=p+value+table+for+chi+square+testPDF 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_off0000ef0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0F 10784 bytes
SHA-256: b4a1acad15802eb9b9e4cc9fa1670f6aee6703558a777219204e4bde98223b44
font_01_sfnt_off00010812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10812 17908 bytes
SHA-256: bc33b851770f78e6c27b49156e75105f9f5d1823082e9c5eb3fbd58856c3a09a
font_02_sfnt_off000136b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1