Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf26b51a95a877f7…

MALICIOUS

PDF

91.1 KB Created: 2021-07-04 03:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aad0d778583c0954c6a22d6c868819f0 SHA-1: 6535088699bbf670dce378b0983ac6fa36aa8039 SHA-256: cf26b51a95a877f74133ef81cf99b485b487515b05086f6ecc92201444442a1e
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 functions as a link farm, directing users to multiple compromised WordPress sites hosting PDF files. These PDFs are likely designed to exploit vulnerabilities or deliver phishing content, as suggested by the 'Pdf.Phishing.Trojan' detection name.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/bd3jsco4lv47tmv26gtfh808cp/mojexomisikabuwewoledaki.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096eb83125ba---fuzakekugi.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/19bb5fad456e680969940012c0ef3ff6/7133448209.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9610ba7c47---duporixazomur.pdf
    • http://nfc.soo.jp/file/336400930.pdf
    • https://deepankarbasu.com/FCKeditor/file/67688728467.pdf
    • https://capecoralliving.com/media/file/81219491442.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607babf0eebd1---56530480788.pdf
    • https://melz-feu.ru/upload/pejukowod.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078218e89c4a---75621991974.pdf
    • https://unosms.us/userfiles/file/24732719258.pdf
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/nejasokero.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dd29f1842---88235288903.pdf
    • http://orkoien.com/userfiles/files/muramenatepopelof.pdf
    • http://yoron.net/up/files/gusarasikamadazopizaf.pdf
    • https://questyme.com/userfiles/file/29661266637.pdf
    • http://ranaghatpchsschool.org/userfiles/file/gaferuwelexu.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160982c2b3a1c5---karuxekate.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7d38f3cda---zeramomepoz.pdf
    • https://kuzeyilac.com/resimler/files/39207516039.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/aeele381pgku1c36h52gmc84i7/91098277769.pdf
    • http://massageindex.nl/images/uploads/69007150153.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/edh931qnf6jt16g9n8sjjo17qj/11851815419.pdf
    • https://noithatkuongthinh.com/uploads/files/39055604409.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+cook+frozen+lasagna+in+glass+dish
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7C 16792 bytes
font_01_sfnt_off0001158e.bin
dda226a6f7a4682a5fac6187e3d5149b77d0f192c64201044e21ee798bef2511
pdf-font-stream PDF embedded font (sfnt) at offset 0x1158E 18196 bytes
font_02_sfnt_off0001457d.bin
0fdd11bfeaec4c53fd5fd9922fda587cac52a59b94efd3c51359f9e90d9606ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x1457D 10984 bytes