Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0cddfe93ed92f5…

MALICIOUS

PDF

89.5 KB Created: 2021-07-29 21:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74009d3ae1a10b7447781dae49713fee SHA-1: 90dc00e1963133a7488ac3a966c16378e187fa40 SHA-256: 8a0cddfe93ed92f56cf7a4b36768e77bd638cf9b0fa9dc6c380e3b3166884913
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. 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 embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5406703d9---kitaxon.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f4ad36f7b---31261009215.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c13877fba---43587910174.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/38f378eeaed2574f567cc3b10a135dd8/zimetizidevunagu.pdf
    • http://champaigncursillo.com/userfiles/file/64065456791.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf997d52c2---81064427927.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/51890303941.pdf
    • http://eltonltd.ru/sites/default/files/uploads/79224366154.pdf
    • http://aarogyamedico.com/userfiles/file/14791914138.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887567b1230---62852338869.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e3939a65fa8---55209428807.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fce4976860---tojobegusaguvijefoxu.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/n3bssknv4p1j4pgf86grgrdjtt/vusuduvolajet.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b551b2998e---xexelavukeritovo.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609838a3e7a0a---5270698738.pdf
    • http://ck-kutnahora.cz/gais/image/file/pifemulup.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732884817c3---26766707538.pdf
    • http://angelcabrera.com/FCKfiles/file/62917727639.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e28ea06dfd431cfb92d65e561ab3caa0/51432979392.pdf
    • http://thingsantiquesla.com/userfiles/files/57498168396.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a409879004c---segozuv.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ac4883ab4---nobasivubebofunem.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/3c136602c5525beaed46464a25161a10/welolavuvunevenunoz.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/48ab81483b71d433dd00f4d3a26fa85b/mirigola.pdf
    • http://scard.vn/app/webroot/uploads/files/43212842030.pdf
    • https://mimpishiosatu.com/contents//files/79205133229.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/0pb433mghg0vfkrpnq4v0qng83/zererel.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=programacion+con+python+para+principiantes
    • 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_off0000f48e.bin
d6d9d37eab3d924eb66243a1180c1f009d9e2528daf9906b9ed74d7afcb2fbc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 18400 bytes
font_01_sfnt_off0001240d.bin
9a9572849ad2386a17781ea6c904b32d10a4716b96922c8067d4865128a9ae90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1240D 10888 bytes
font_02_sfnt_off00013d22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D22 16792 bytes

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