Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ecedc78ef81f81…

MALICIOUS

PDF

73.8 KB Created: 2021-09-01 00:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4a31fa428a5ee453c71cc8cd193a8de5 SHA-1: 884e573532d9deb57a265d0cf6f4d9b505f09860 SHA-256: 87ecedc78ef81f81dace7d06606f9ff08f8a9aeb7b9eb7673510226b1c4103fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. While no scripts were directly extracted, the nature of the PDF and its embedded links suggest it is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/d661fa8cc323b652a9b40eee329ac2a8/saxaseji.pdf In PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/dpbklmgs45704phlqq3kruihdv/38253435854.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/loburagogovezodikor.pdfIn PDF document text
    • https://tonitomov.com/picture/file/givasatevezakef.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160805c75b055a---32357056075.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/jefozusalenad.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210727_215019.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/51395721613.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c69a4a8fa4851f97b6d17996f8202f6f/2685125433.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/iktajkqp79g9q10a1g8ie523a1/42846858845.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903f661db2b---baxubidojedotiteteda.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/44247917913.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bf345201f---46032013150.pdfIn PDF document text
    • https://migger.dk/userimages/file/wigejuxerajebutuburezu.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/596649700.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/tomumaluzewixu.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c389ba2a95f---1415033361.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8ecb76a54---verelojabisujasedi.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/xikuta.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/73926455515.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/gufagusatalogonam.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/gewuz.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/lnn8v095q2hk1ahbdq05lgk55c/pafutodasijamuwubonipelan.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/dapakuxazif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+courage+to+be+happy+pdf+free+downloadPDF 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_off0000b7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC4 11044 bytes
SHA-256: 8781360de255983c35b46db65db2d990dfa956470ebf3a4451965658324340ab
font_02_sfnt_off0000e919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE919 17788 bytes
SHA-256: 3a044e4cf898c701a853c07db6b8d748726b0d76e899c8b25cc9171507e6c5fa

Open this report in the interactive analyzer, or submit your own file for analysis.