Malicious PDF — malware analysis report

Static analysis result for SHA-256 1906e3b2a14debc1…

MALICIOUS

PDF

80.9 KB Created: 2021-06-27 10:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 476b84b4c9af2321ee8b1985fb07df5e SHA-1: 576d513d0e29c0360036bcb49eddc87921a8537e SHA-256: 1906e3b2a14debc1daf34a1f40dcbfa95661a37c8ad4b4bdbc212299c011fae5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://popnmusic.fr/userfiles/file/redagixiseviruxad.pdf
    • http://amuseonline.com/absite/userfiles/file/716281256.pdf
    • http://aisef.org/uploads/userfiles/file/file/35294019542.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b58fcaf222---38804973144.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/3f9c68e28ea66f747fd94b9fbe5c89d5/fatawefofotinupe.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160941b388738f---ziwin.pdf
    • http://capital96.com/userfiles/file/fodizol.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc015012ea1---49866352489.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f7db8aa2a---37792404409.pdf
    • http://bogelaipigeon.com/upload/file/futomunanazivugufekin.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/ce4bcadb72f4395cde2e236cebaa7864/82987544068.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160805b87f3cca---91987013388.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899112c1848---36415204510.pdf
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/43769361164.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d345bd581c---pipilizolakexefoget.pdf
    • https://tavio.ru/files/file/tazawogedoj.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/03357e3b4a0de93ca8d7e6b36889464d/98065665917.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b06b930397a---2531197329.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079f6fc71871---kefiwuraxapavedonez.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094346ddfd63---vuviribuxuvod.pdf
    • http://foto-klub.dk/userfiles/file/busuzujinoremimuruwajil.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160990c5156531---93202031487.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5a7edc0ec---rebaxifaja.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/e69fe1cc0a21e3ba41e0f8e6bee88a69/xobiduzovak.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=commercial+driver+guide
    • 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_off0000db3d.bin
0e9c8fbda4587f9c91722664a10bf56421abe41372f104f62c0f65d04f3997e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3D 16720 bytes
font_01_sfnt_off00010699.bin
42bebb8caa330e32bd4d3e9a2ebc3358003c8b1649e3572df973c7cb742e8142		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 10540 bytes
font_02_sfnt_off00011e64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E64 16792 bytes

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