Malicious PDF — malware analysis report

Static analysis result for SHA-256 70cf6633b454c905…

MALICIOUS

PDF

87.3 KB Created: 2021-06-30 21:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8a335129937adeb354d79ecd97f3d12 SHA-1: d16bccc8c1796ed4cf32db191199322d016dbdfa SHA-256: 70cf6633b454c90538adf40d40a5f9a2bc1a05347a5f7579d29c94665d198ccf
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to other PDFs hosted on compromised websites. The primary purpose appears to be directing users to these malicious documents, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fba024c75---pipazidonirirabel.pdf
    • http://soft-pro.hr/upload/datoteke/45124218452.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b6255a7f692---18045825786.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/7796def976b4ee3685e797cabc46766f/12590746029.pdf
    • http://noxsun.com/jingkelun/userfiles/files/20210606042753.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/906908f158d309b83fb2a38aedc3d08b/9558741450.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e7726e8c83b28efb87801aacdfb7f0a0/nijosesabiforapesogakazup.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/72g16lai1uglpiisd9uu48lih6/kewotiv.pdf
    • https://agrilaui.com/userfiles/file/60593166581.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbde632688---27837051869.pdf
    • http://screen.by/images/file/rawufoguvilumuxozogoba.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd17b670fab---pewefulumalomimide.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/tu88p8hfe7778gkvd785uvjr4g/92634351118.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d41d17a683a---xidun.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06e11288b4---tadinuzolorefibetugifuno.pdf
    • http://babywagen24.de/userfiles/file/29774983895.pdf
    • https://parklanehotel.asia/userfiles/file/20819677305.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703df1e979a---moredaf.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/10cab46a42e21000eb1dd4546ce73c57/tifasuwuv.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dd7f652c5---valuzawatasifujudugawa.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8c2d1855f---64990867339.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160750b17b1c5a---pupilamenigefid.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/2e0d4032fc0fa607ff8f46dd97cda92f/rovejixilajifefatibokig.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/b33387bd09ad56921c28f144b667477b/satowifefuxufudinoxewokum.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=turtles+and+salmonella
    • 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_off0000f25d.bin
cdef4f553a929e9e3438ca63a7e31b1379f5cb4f4da0347fe98e6867b1a16938
pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 17112 bytes
font_01_sfnt_off00011ec1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC1 16792 bytes
font_02_sfnt_off000136d8.bin
77f99c344a78a352dc91600bb3152604068acea1dd67187c317e5fd7081915c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x136D8 10380 bytes