Malicious PDF — malware analysis report

Static analysis result for SHA-256 615396cf948e0d11…

MALICIOUS

PDF

94.9 KB Created: 2021-08-26 04:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9d04bdfc2b948e0cc5ac834049898210 SHA-1: 96f726f32dec76b84dfa9d62212f39cef52e4120 SHA-256: 615396cf948e0d11bde890aca1dce2e48c70c1c73b1593c3a8ec2dcd41fee8fb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://cgeminfos.ma/upload/file/migoboj.pdf In PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4f20cddf2---27472892488.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/pojefob.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/jobejawajaweterejukoxu.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/26419979238.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/4440268233f9205b53d05f85ef34eeb6/jovaxu.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/0d4018bd202e2e7cd8cca8b3bc24fd46/mepadepezowosavilunerido.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f495f436785---43469766946.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/34db3795ef822793848e8fd9d4aa1e4b/77688410065.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/fe66c6a36db34fbe728d0ec5d7ef1b5d/kupegeresijuwa.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609474a23af80---44631717083.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/vumetufodunuju.pdfIn PDF document text
    • http://produccionesproezas.com/clients/2/28/28ea8f13eb032e89cab2838ec144e7af/File/74530969078.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/luvaborivinuwejavi.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/vejegored.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/veditomejoju.pdfIn PDF document text
    • http://maidichike.com/upload/files/19156129009.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/fanepukevite.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/b4fa9b7c3905614bb5878995d6df24c9/zenemamitejoruw.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/sejivitasanasegikota.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/80866162986.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/8917597559.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/42376710429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=lectionary+for+mass+pdfPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210810/16285944539934.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_off00010e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E17 18144 bytes
SHA-256: f2c35cf7787e03fc21886f15bfa31bdf1c61a4ccdae4f05af631cef413cc7ee2
font_01_sfnt_off00013d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7F 10804 bytes
SHA-256: f1cf60ee4a722ebc90781c18afa06f8af12a3f4af25bf08aba0ca1fca8f2ea0c
font_02_sfnt_off00015673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1