Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed6b1bdfb0a935c…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 20:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 04cbd3f3f37d738f1f24734e7013180c SHA-1: 8743d2bd687893b1ab7ef03123db1d53484c8e77 SHA-256: fed6b1bdfb0a935c67ba830e4438c70e4318159068d30b16dfa8c7b30ecbd368
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to various websites hosted on compromised WordPress installations. These links are likely used for phishing or to distribute further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c205340f33b---guzujatakagofotus.pdf In PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161307ceea9fd4---48236291378.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/8bb7a09d0883fbf0b38def3a1ae4dc9d/rewogiwab.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/pugakipibegi.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/38650948176.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/3e69ef95d4d72f6375291b74b4ee58c2/83054043522.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/kalevetag.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/poxotodikedelos.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/68426378408.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/mobuw.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/glra2kvo9vthjjpjsg0dod8vo2/1791300967.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///pogumevarafonesatov.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6ec4b84b3---93807293721.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/386704635.pdfIn PDF document text
    • http://thecrayfamily.com/clients/36408/File/maxivufododagedi.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/xuvekinejaluxomol.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/81248552574.pdfIn PDF document text
    • https://cape-electronics.com/media/file/zovelonewo.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/tefadifufutikatesusifiti.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/73389872785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=gastrostomia+percutanea+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_off0000d2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB06 19396 bytes
SHA-256: 24dd9f29cb9494b58a8d5710cee2f9d3256661da851363f9df1765d3590bd019
font_02_sfnt_off00011d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3F 10872 bytes
SHA-256: 5639130fe2a5506d6b80b97d804b5378e9ae624a3dc621bbff36624201838dea