Malicious PDF — malware analysis report

Static analysis result for SHA-256 940f8798309efd4d…

MALICIOUS

PDF

61.1 KB Created: 2021-06-25 08:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 57645259c3416197b40821d2a722c518 SHA-1: 046b7351a4bac0b6f93a1e7b3f03a9480d0e0da5 SHA-256: 940f8798309efd4df008bb86ef51bc3e415148e3819ac1a564fcfb3f171fe184
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30674d998c---34499112383.pdf In PDF document text
    • http://allaboutdowney.com/userimages/guxoxotuzowu.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/79492976258.pdfIn PDF document text
    • http://alkanboya.com/files/file/%5C/97865093388.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/ramesuseditujamu.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/35524492009.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/31032716090.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/17184716678.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/cf4e595ecf2b179d10a470372f6fa84f/89380234281.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160aacc4797db7---wulobumetinarazilub.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/jifizu.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3fae19241---78381421530.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc9662626e---vuluvegabovusanesi.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a216f9a96b0---58154515514.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/temulo.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/ac80379c36ee105dd106c803010c8574/kugopobajuwobipefigif.pdfIn PDF document text
    • http://camwater.org/media/files/vigaf.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/fsi6jsvue6g47pa7mblsnqrm0o/80840757724.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=al+kitaab+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58A 4952 bytes
SHA-256: b6f990b5aa0b5be4e51bc092a19d20945238fd887d7d563969b558ce4bc9e70f
font_01_sfnt_off0000c675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC675 9752 bytes
SHA-256: 7e3e27ab1a628ae94bc0533fe6a396e7e9e3855e4076fdb3740d88c785b570c6