Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1db0fb6e5491d1a…

MALICIOUS

PDF

80.1 KB Created: 2021-09-23 22:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b2025e1cf13b9f5a554ecead7499aad4 SHA-1: 64d383d582c7466ca74ec8519f5bfb64a4f95293 SHA-256: c1db0fb6e5491d1abd0d9cd38d5c55f85345cb38b4aa32f78cbb6639182fd6c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=adobe+after+effects+mod+apk+for+android PDF link annotation
    • https://netkat.in/ckfinder/userfiles/files/danulubitar.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/12330412884.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/69089000274.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf5081a23f---50422383289.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c56272a0a---19709789853.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e38b020a6ad5ba634e9b3cc9428b1d26/28596172289.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/nepuvigitapapi.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/d8u80crl8i07k89aq2712ki46m/jopofuxowegiwakokexodibev.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/raforem.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/wofuzoxiledijozuvod.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ume62c3iqgragak1ed5nhn1c2a/17567824318.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/42934331419.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/68874790311.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/lufejatoledudutujovow.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/97674377603.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/48709148850.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/tufetokipasi.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/tutid.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210909090219180.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/3758188507.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/55997454456.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/58340233704.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/faxuvupugosogojiteled.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/52494387900.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_off0000d3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 10948 bytes
SHA-256: b44cf7fb1a54da9dd14ebd4d36e894f4211059fe09034ca8d51daf1d32528790
font_02_sfnt_off00010520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10520 17604 bytes
SHA-256: c28d439d3cc2aaac90975028e580accb9771ac83e3e2996213d537df20157e63

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