Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9768c5ab36d03a6…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 05:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7cd0744455a284587616f8d233e4416a SHA-1: aa7e1c213ae33f167c2c119cce1e9bdb9c580730 SHA-256: d9768c5ab36d03a6d6ba6acd2d3532bf181a97ccbf8d47e21f8f33febe9717d0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that function as a link farm, directing users to various websites. Several of these URLs point to potentially compromised CMS uploads or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alituncer.com/userfiles/file/fiwobilokize.pdf In PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/26245884996.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aae891ea627---74266763883.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/76837396614.pdfIn PDF document text
    • https://seerupit.dk/assens/file/37738745009.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/77028187748.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/5kkbbpek0979jkjj5g0al0jd11/81063775810.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/36bd4e967eaec041fb780b33f8fc2cce/zinukijibevipepebitu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97c4438fe---1824750730.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/f7oarck6dbr5v7dr0igiu7c5km/15291916610.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210826_485CFC9024428BCB.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/25ac4dd8329f5a91a95f6f1386be0682/73180315627.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/47562043779.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210629182454.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/37add89adfa5d87868f60cada1937998/65511169237.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/165593165460a92c6830c82.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a48478c5a---9139525376.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/e5e044ba94be20012c6760466e3bddc7/puxexogewifas.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac8e00e06f---vikujesotinidij.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7tvog6a7dpv7pjea8tpj4ctue1/lomivuvekitavurole.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/71543828569.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/830fc6a037f04d641f02206d40d61610/49640978606.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d9753e592dd092354dcc577e8bc7b1d2/lofetaleliriromod.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/55078057545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=adjective+and+adverb+clauses+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_off0000d823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 10908 bytes
SHA-256: e65f7e3930cdde80cb150204c15f8316f8bc41b2a3eb0cee7fc97a21b10cab82
font_02_sfnt_off00010953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10953 17980 bytes
SHA-256: 4408b3972c1beb856f7dc6d245c9c20f0cce0d33a4d93864adf822f6ac54643c

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