Malicious PDF — malware analysis report

Static analysis result for SHA-256 343d9ee5ee1aa97d…

MALICIOUS

PDF

77.1 KB Created: 2021-08-08 22:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7ad3bf52f204c92fda58550c916f7053 SHA-1: 265782392139b9215c74bb9147f987172c88c5b9 SHA-256: 343d9ee5ee1aa97d98e9d260832b2cf8b7f8bc1206341b11cc5bcaff9b40a470
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of malicious activity, likely serving as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://parc-hotel.info/file/1886865587.pdf In PDF document text
    • http://growlink.biz/userfiles/file/kokatoga.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/pukupisigalamoxozizadad.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdffe206837---81962875824.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f90020d77cc---xenutudabiporumejagedinij.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/4874877414.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/4bdad900e63cdcb328c4e3d7e51b50e4/75264109532.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/ladopigiledixusasulixine.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/4066048100.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/57888865573.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210610161605668.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/kr2kattkkdelt63qovgvq0ve6k/zawad.pdfIn PDF document text
    • https://thietkevuphong.com/uploads/image/files/36724001370.pdfIn PDF document text
    • http://masonhn.com/d/files/rolofixedujovozun.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/51002393007.pdfIn PDF document text
    • https://areicon.com/images/file/53332184325.pdfIn PDF document text
    • http://someteme.com/archivos/_20210728064136.pdfIn PDF document text
    • https://pathakpharma.in/singhania/downloads/file/gurokusuju.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/uvgvdt8bf4bo0bhlmbmsrvavh5/sulukowowejesaje.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/f69fdd3ccfb010d92c845ac4a746586f/65282440891.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/xakovuvegorefi.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/53529773855.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/pavel.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610500fd310a3---jotokotefatowilarikopaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=bible+story+coloring+sheets+for+preschoolersPDF 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_off0000cbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC8 10904 bytes
SHA-256: 23535d6ff9178c5217153876c113a2b31f455415e07552e652825337653ec0f0
font_01_sfnt_off0000e4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C4 16148 bytes
SHA-256: b093eae64ab91596b6c16581a80c14b79c30dcb0e0e037119ac7ba19c7bd270d
font_02_sfnt_off00010e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1