Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb491e4e2ac9558…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 08:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b7a57e6e6c5288fcb52607a5a522f9b9 SHA-1: 01730f41f34be668f913aa78c5bcef5c23b4f93b SHA-256: feb491e4e2ac955806cd57aa588a5f5adf92a3c3ab9d14737ae78d6b81277889
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically identifies links to compromised WordPress uploads. This suggests the document is designed to lure users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://chcial.ru/uplcv?utm_term=nv+publications+diploma+books+for+mechanical+in+tamil+pdf PDF link annotation
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/6f0420f42a0c7aeaf694a37066590b89/duride.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/3trk4nh34rev2lcbdh8v9lpso1/pagak.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/47013097545.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/881bbd7299ff6ae31be5f7e0abd4c322/33043560251.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/dc104ce11d00021b2765f8af1ba3d43a/kerugevutowuliwuwopakuni.pdfIn PDF document text
    • http://artdental.hu/editor_up/sovegisufogijes.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/f63b9b3fcecf09f2a06d4f31342d0ee6/94616582702.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e0fb3edc06e63511deeb0f2f1d4bd192/59575139310.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/5a9eff9c05c912401539d5a8faafd8c6/polofurebikozugoli.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/tvqp4hktstfmp0nhde6v4mg7e3/faleripegaditap.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/dagil.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/12734800548.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/857c7012ca313b277f4900f771cd805d/giseburewojefuwisugibip.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d9b071346---26602970325.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b574bdd2b6d---70921234757.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/48550436042.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f85d4bb6bfd---futod.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/kivutatawudutobudujipuju.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/wegokezomapinabor.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/pobefabo.pdfIn PDF document text
    • https://activepymes.com/pub/file/razafok.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/37591678118.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_off0000d959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD959 17596 bytes
SHA-256: a5707d189e9da716c65edea7e1774d3b7e1fdc86c476f275f33f00e8d5dc9260
font_01_sfnt_off00010703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10703 11260 bytes
SHA-256: 81762c361cde054cacad7d1004243977c3439fb6c74dea4713fbee2a3b22a3ce
font_02_sfnt_off0001210a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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