Malicious PDF — malware analysis report

Static analysis result for SHA-256 6763699e06ca7eb7…

MALICIOUS

PDF

84.1 KB Created: 2021-08-06 02:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6c8123f86cf01ae8464bd6f3fbf240e7 SHA-1: 334f1e26a2e4f231f53f32efd66069e458cbd3b3 SHA-256: 6763699e06ca7eb78c34ab7c540113b015c2c696167c55e0b0750ed150050959
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both flagged this PDF as malicious, specifically as a phishing trojan. The file contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating it functions as a link farm. These links are likely intended to lead users to phishing pages or download further malicious content.

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://ymmicro.com/files/files/dijadunum.pdf In PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/61122494001.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/wewesonexiwikugex.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/fupimimolekurib.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/1980599568.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/luwowiniduxiborukeki.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/179c6f91adcadac06e0f71d72a1917fc/68754986888.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/vutibarame.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/aa3bbkqdrjbk8oun2kq4qc47b3/9091716778.pdfIn PDF document text
    • http://fittbike.hu/files/file/xufeves.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/pojudaremokojozupexet.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/c8648a0e426447072b6802212226b653/wulufuweninet.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ccdd879e0---mizemokoxolurofuzozomu.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/pikufiwilo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c5204189a---82919303127.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723ebd72036---nisupujasatenufepixadoda.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/f0c90a88a39fc011821029e4a342a216/22913517614.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/690607b66436cbc1a6de1f8a9cc11c4b/wimuzanopibixemenuvig.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/23356188327.pdfIn PDF document text
    • http://soflacops.com/clients/83266/File/podupurigazabizizegez.pdfIn PDF document text
    • https://rivnerun.club/images/files/50705739679.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/a307b681c9ab038bc71724f4b260903c/vudelarotoveromusuw.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/47j7tk2e0tsae3ae06jntgotd1/bepitefuwidumi.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/40686316212.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb34bc5620---96657641079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=soap+and+detergent+business+plan+pdfPDF 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_off0000e5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DD 10988 bytes
SHA-256: 50b297e840ddc24f1fe17c82c8d2075a7e51063dc6ef415fef85065b3e0168c2
font_01_sfnt_off0000ff02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF02 16764 bytes
SHA-256: 52e5d95126812ae765f3943b4ef4d9269d93a01f50518be91509b78ea53cca4b
font_02_sfnt_off00012a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1