Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65d8236ea737f02…

MALICIOUS

PDF

92.6 KB Created: 2021-08-20 21:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 9c7a065fb5b99b717b9548efb165566a SHA-1: cfeb9285681ea969900202fb8a0334ea29206a1e SHA-256: a65d8236ea737f024524b46a1789c82fcf7b569a76b294be01f0250aa187a28b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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 http://domeinbeverdonk.be/assets/files/file/30069645392.pdf In PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74a99c335d---44912547413.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf4acb8029---87439033841.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/84762831667.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c5858188d---99256581153.pdfIn PDF document text
    • https://lncl.org/ckfinder/userfiles/files/rafofetogebazuposusine.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/wufalapukepidowiwejerex.pdfIn PDF document text
    • https://kawanmto.com/contents//files/suvivewepesizumobuv.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/24af3e461b8c49e338a8bb796464772e/zuzufaduvuj.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/fagiposumap.pdfIn PDF document text
    • https://totounited.com/contents/files/19664578346.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/fizexunitusegelinumipejog.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/47105229081.pdfIn PDF document text
    • https://kawanmto.info/contents//files/luwemifotosawiwesamisibud.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/83d0f7b98235f1097eef107667acddd1/8121847441.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c751ecb666---87414087420.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ef3mtaegv5jlbgb7sheken1co4/koridiv.pdfIn PDF document text
    • http://abpaluso.com/upload/file/21813021216.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/kuwidazo.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/kifopit.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/0a4vti2a82gfucgfvdh1vssc7l/48352639316.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/70138469986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+documents+do+i+need+to+apply+for+funza+lushakaPDF 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_off00010415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C27 17256 bytes
SHA-256: 81443db12b5e6f1c7917096cf8a4878b6bf7885d5a3488b3c96f348a2891604d
font_02_sfnt_off00014940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14940 11244 bytes
SHA-256: e9d693b8d387251fb79686d9a02fdf6a989762cf7804e4dea3495c2e95420e60

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