Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8db51fbfff7d493…

MALICIOUS

PDF

92.8 KB Created: 2021-07-07 02:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fcb2aa83ec4dc192e9a491236e09db39 SHA-1: 304654bf2f9b41e648597e97a621bb5b6a766a4a SHA-256: b8db51fbfff7d493a82432cedc13dd1ade98ddf59219f3edc3ea4d0f8975130a
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 CMS uploads and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 https://irlanc.ru/uplcv?utm_term=critical+thinking+questions+about+culture PDF link annotation
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c259ae9cb84---mogujuperituwore.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/wularijejodudirexog.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/fq104qkc18fk2jfi78d596bjo3/60901642097.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/71118121685.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160797d78d58a1---virazajizuvoxukexuwa.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/gurosalukonakimij.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6cba84b1---vinavalojozofi.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/90033941875.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/92462811fa9ad30c949bd12fe6b956cc/kupoxowutam.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609c16962a19d---85245246844.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75515dc458---tijel.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/92919084317.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/i40s2le1gsagq8nf6adqlm9qil/fugugepirekos.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a15078d132f---942526643.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c922b04d529---nobojelo.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070026778593---rofixanat.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/jupid.pdfIn PDF document text
    • http://recrute.fr/files/files/jisilanifebukipuxofe.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/nanefafujopasaviluv.pdfIn PDF document text
    • http://plncse.hu/php_data/file/vaxozurivogobowuva.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/43372529531.pdfIn PDF document text
    • https://nexusmediation.nl/files/sekotenirurukubewekupa.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/e0a48a5a8a56b595e4993d04e1313b1b/4031346494.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/wopozufedikuvidemaba.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/pabesima.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/48698087740.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/5dcn3p6kllhrrn89cf3jcglrm1/36094347461.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_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 11016 bytes
SHA-256: e91ff46a718dc2bff069fccbdbdac991a48d00f331cefd6dd6d3f8bb0297c066
font_01_sfnt_off000121db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DB 16876 bytes
SHA-256: 36bb81953800b9cd0a14b2ae9af89387a94e08ca34d9ccf105b9bc2a670c437b
font_02_sfnt_off00014d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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