Malicious PDF — malware analysis report

Static analysis result for SHA-256 92dbd16e11070757…

MALICIOUS

PDF

86.2 KB Created: 2021-09-21 21:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 54b72ec1760109ec20a883675e6861c0 SHA-1: 52c6738074ce2e82d80a8bccc7b03d07ba3ede82 SHA-256: 92dbd16e11070757d30ec2c6c57d947cb2593bdbad54738dc34c6fa40be195a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=stream+quiet+place+2 PDF link annotation
    • http://ukwoodrecycling.com/userfiles/files/85148818238.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130d781be4d1---kabuzix.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/90454236599.pdfIn PDF document text
    • https://olterus.com/contents/files/12624436774.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/41359648279.pdfIn PDF document text
    • https://tl-systems.hu/files/files/lesowi.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/kuvim.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/26348496738.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/kanemutewakove.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/kulalefisewamex.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-06/2109062245220890151gu3d9y7pi2h.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/werif.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bca669468a---fidesiluxedufosixuw.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/diwuvoruladelaxixinik.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138292698b27---tonarunigulubunuto.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/70873409190.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210909103103.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/35287780867.pdfIn PDF document text
    • https://paradigma.bg/uf/file/43511811326.pdfIn PDF document text
    • http://linza-market.ru/upload/files/pipateviji.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140e634c57f3---rufinogibezor.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/rexevepotobusamekukeku.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/mozewe.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/29311640749.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/28184668428.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_off0000ecf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 10584 bytes
SHA-256: d98ae3be2692230e3e57df5200a07d2895c9359a9207232ca6ec727e5e7c7bff
font_01_sfnt_off0001052e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 17756 bytes
SHA-256: 1a4f63b26e7567c4627c3121d1e5913a499a308b4af1fe91a40078b84b5758b7
font_02_sfnt_off0001331d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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