Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fac47d6d8681b42…

MALICIOUS

PDF

123.2 KB Created: 2021-06-27 15:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ecf5a35f4c206ace1c95bafa0e84dd1 SHA-1: 799e1152348f1234797583b29920183aa565288b SHA-256: 9fac47d6d8681b421729934538a7c799254620a24d8bfeaa68f34249b0d341d1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, forming a link farm. These links likely lead to further malicious content or phishing pages, as indicated by the PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The presence of embedded URLs and the overall structure suggest an attempt to lure users into downloading or accessing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9676

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://smidgel.ru/uplcv?utm_term=the+sum+of+the+interior+angles+of+a+polygon+with+n+sides+is
    • https://hagakure.by/upload/editor/files/ziwujopibu.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/e28b9e9a8a9c71969bf55907bced1916/zekimifuk.pdf
    • https://educhina.mn/editor/files/fujagezixufifotukeva.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160861e4eafd30---92993891572.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0171239cd2---zediximivakituxabogazi.pdf
    • http://carefirstyoungatheartgala.com/clients/b/bc/bc61c41cf33a111e4089ebab1e34a2ce/File/14605864027.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092165b7c339---xofolupepuwubetufozut.pdf
    • http://feldbach-tourismus.at/files/zafafoponofigonuremoze.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/fe0b704dc1c3b3a92fbeb517a6e6058e/12725225117.pdf
    • http://theheavent.com/userfiles/files/72793523261.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/8gr14ek5lar5kpmd8963acjgv3/gajida.pdf
    • http://shqinze.net/admin/upimg/file///xukinefubefogomine.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849ca49a496---mipaf.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/3fadef8685ab9b317baa541f4a4e1d36/kajelagejosud.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/7b1e6813f6d7f288193259ed342ea79b/nanebitipojesone.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2383a96ea---58064817537.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097da9a54d84---44670358912.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160761d34906f4---detome.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/a02d871525ed61c9a19e3f183a5de6dc/jomidexipufixotozavi.pdf
    • http://mynigaoe.com/upload/file/20210511124618.pdf
    • https://dichvumayphoto.vn/webroot/img/files/gokiruwuzipobekofid.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b153941626---8558943309.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/0ceefe3632212d8386e82728095e1f11/95518840159.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d627069770a---vusixixeramodonobikewolo.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971e948edea---puserixitafon.pdf
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/1534f62d184042646c4ffd8e38e5aa74/10694207925.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015dfd.bin
3d1e4c2169843e7cbc0b288fdc721933134765afd9f792a72360470ddc610be4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15DFD 21916 bytes
font_01_sfnt_off00019707.bin
2b090f039dbe89583161f72e2650cd05b0b22b0b833f06ed9ca43194d4c60010		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19707 11208 bytes
font_02_sfnt_off0001b0f0.bin
325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0F0 16084 bytes
font_03_sfnt_off0001c61c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C61C 16792 bytes

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