Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03715c72d8ceed7…

MALICIOUS

PDF

72.8 KB Created: 2021-09-06 06:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5844409cbb6018fe750ae25830e22d86 SHA-1: 9b3e88f7ad012999f1c30a9b1ec26cdc65672dfc SHA-256: f03715c72d8ceed7cdd5c2f87eaaa4c953caaf54678c5d71d2b011d70ebc99fd
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The primary attack pattern involves redirecting users through these compromised sites to other PDF files, likely as a lure for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://propertiproperty.com/Uploads/userfiles/files/14630440325.pdf In PDF document text
    • http://zagazzo.com/userfiles/file/perizupegonerit.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/733b0c3020bbfb0bda2f38fbe8ac4644/96300853222.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad281ce4eb---38270057009.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/sopegu.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/26946342536.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/75052600471.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/46674297856.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29147cc8e9---duzinenorajosisumilixaxa.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/pabewevixunugixebo.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/gusozipaf.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3de9218e0---10958172324.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/44934673217.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/bifitel.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/66680047538.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/roxenezizukax.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/8242351867.pdfIn PDF document text
    • http://premium-t.info/files/files/19509976635.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/78274889629.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/jexezu.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/82346974797.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908b6b5eb49---terijijim.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202108300751354612.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/06d5336219ef1e7f7a594cf678d62283/ratelinatoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=iba+cocktails+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_off0000bb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB94 16560 bytes
SHA-256: be3dc1100a7ef5e736a741b8b3709f93217eeabaf49d1ba8999884e2586201b7
font_01_sfnt_off0000e5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE3 10460 bytes
SHA-256: 72c8f236779f21aec9c6d46b2628304bc3ca1527eb0ce4b2ccb01cdc2b00aa62