Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a55d38590d67ce…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 09:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c489916cf6bb59e08ce6186dd35f4aa2 SHA-1: 196ebb1d293d20261244893c0a03a0af10030fd3 SHA-256: 88a55d38590d67cef80092d0068138900c6adbb0583ebcd9303cafd11a850b48
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The PDF's structure suggests it functions as a link farm, directing users to potentially harmful content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://barrybusiness-crm.com/ressource/devis-photo/files/dadaroket.pdf In PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161149d5b5fd25---92612979082.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607b41509d66e---21449019226.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/e7d4d60ad2fe5d2e1e45423a78781778/45971943366.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/2930728500.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a317829824---86122477023.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/55968354937.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/pamuw.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/9893596802.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2b90ffa18bc7e8188c423f9b2dd97aff/25643807012.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/dowalage.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b7aa181ade4029e7e78e8870cc6c7815/57182236564.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/zomidugeganuwezuvuz.pdfIn PDF document text
    • http://htcable.cn/d/files/tukasokanibizunuwovuripaw.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81b1765c18---29664329447.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088ac57a3d06---gaxitokimefanotojedowi.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/mimeponuzif.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/92369324868.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e564a2f3e0---disijeduwalowapunepabole.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/15999688952.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/fikitumo.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/79059884107.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/60217397044.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/0746274278.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/62212787797.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/motupusofi.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/65946170075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=glaucoma+risk+factors+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_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB88 10776 bytes
SHA-256: 632e441061c2ad44165279e31cd2b889a17219643e2d9e51935441ae288ab17f
font_02_sfnt_off0001145e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145E 17184 bytes
SHA-256: 820988725de624085e62ad93450bd31b65fe6f156cd67008a565b352de2cb79b