Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1053ebaf5287c6…

MALICIOUS

PDF

87.4 KB Created: 2021-07-16 11:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0717ec238d736b7c015911e6d5270d06 SHA-1: f36f9346a769a30aff97d88ce23f561564c4a49c SHA-256: fc1053ebaf5287c6b8a8c5642f818f3751d2f4c64bf4b2af2b4f35a3dc708fb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://cuspsurgeons.com/userfiles/file/48070639285.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/bc1817c5d99818a0bf1cad3fe1754ece/xizejaxebakajugovu.pdf
    • https://samsungvrvklima.com/upload/ckfinder/files/8099925184.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/05b013a8b7309538fc1556020ec614f6/9420082087.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b221ddea59---peruwap.pdf
    • http://bitite.lv/media/txt/122/file/61792806583.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/8ji4r2330utdad0lqpfdjq9tba/dejowu.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b0504728c46d2027db257c245806705f/zawuvokogixita.pdf
    • http://peaceinsrilanka.lk/userfiles/file/61419255750.pdf
    • https://living-stone.lu/userfiles/files/xulibarukukesonogijoge.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609545d529fd2---sugoderigomunilezutizut.pdf
    • https://melz-feu.ru/upload/nowejas.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/raoustss1p96vio0smrvs3sfu5/lorago.pdf
    • http://bong-dem-long.org/upload/editor/files/sazageg.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/02765f7f0d1883b5b127e387b08219ce/1887738844.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/aa317339bf7fe60e2a029d57706c2325/fimurulaxipuguk.pdf
    • http://sovaimm.it/userfiles/files/22874698423.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/cuq5roqu3iffb25dsh1qtfa88r/godesenobazojamonave.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825bfae3409---49785533037.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5f2bdf742---62203417240.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee9819e3afe8ab5a7e9e3f27889885d2/11091753031.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0564e9f09---2157342656.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/90f1aba58b3febda6269e2a00b8ea7f3/peratusodiluzame.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=low+calorie+lunch+for+weight+loss
    • 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_off0000f357.bin
32c6295bb220786c019de9b872decc4698611cd619ca3e5a9c090b72bb7ec53b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF357 16892 bytes
font_01_sfnt_off00011f6b.bin
a7653fc942a04d7405deebbdbe2c64b07e5c5bc8cc71006dbe0cbec72fb6156d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6B 10760 bytes
font_02_sfnt_off0001382e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1382E 16792 bytes