Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed44c6dfb8ab30ed…

MALICIOUS

PDF

86.2 KB Created: 2021-08-01 21:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 42373874ae8364f2cd9469a34eee8371 SHA-1: 7fede8a03bd810a52f3d3445f34d29fcecd4f68a SHA-256: ed44c6dfb8ab30edb1b51d868a2131a1826649b154d1f7cc20ffcd1f3cdd7e08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malware distribution or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://richmore.kr/uploadfile/fckeditor/file/kesomanekeledanoxitiv.pdf In PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9a1f57c20---82124577169.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607af9777aa5b---67343903781.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b64eaa753---50796891525.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/90415332731.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/lixigov.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/6f492bd9bb3552f49fdc3618cee5c9c8/98900432135.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/taxefe.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/fukapaxa.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/87698cc59c4ecf770f8103202a13f8bb/sojibavoxerogumavewepasex.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/0lbf84s9ej231psjieolpia7hg/39150329170.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/4ec97a3407c2c8410c20fc9728dc7990/27941785180.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/19258934356.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/47615620413.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607289b45dd3e---72977959541.pdfIn PDF document text
    • http://ativn.com/upload/file/85064922390.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/71551565028.pdfIn PDF document text
    • http://abc-tel.ru/data/File/7321205951.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/64480357006.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838860a91ba---32973683951.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/28196532961.pdfIn PDF document text
    • https://jaycen.ioIIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=2000+solved+problems+in+mechanical+engineering+thermodynamics+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://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_off0000ea27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA27 17824 bytes
SHA-256: a5afe55fbfe4166b2d0c735884b29d787a5e1205ce54feecad7bae734d4ed5f0
font_01_sfnt_off000117ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13003 11532 bytes
SHA-256: d416ebec917caf507fc2f087da0893253d1bbf327eba1edd4926d6ffc9d07ae5

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