Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c8304c5e09c639…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 13:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 263379ef9047f3b91d2bae516709c622 SHA-1: 893a6b8f9c0f487c9595754a5062a76d489874bd SHA-256: c1c8304c5e09c639a419474f0993afe3ba4d1614ff2ee1d979de329ab6cce3de
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, several of which are hosted on compromised CMS upload directories, indicating a phishing or scam attempt. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://tecs4.com/intranet/ckfinder/userfiles/files/miwalize.pdf In PDF document text
    • https://palcev.ru/userfiles/file/8453263837.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/difupewisuroruwevalofikug.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/76081323730.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607987eb835b0---9195776237.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/jujuxoveweputeraxomajowag.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/jevale.pdfIn PDF document text
    • http://ecologie-energie.com/userfiles/file/ridire.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/ac3a3e30f4c6d25bd0a94b48076f613f/32290647841.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/89053081533.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/towipez.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea6d33327a---vedikalapemiwaxutazedu.pdfIn PDF document text
    • http://rentaruedas.com/files/others/pekoribarakanux.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/nej9uc2hr1jo78dvatqasbkp72/lufifirejorijakam.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/xidugobu.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607650cd74b10---2222098408.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f173f86ebff---21274343777.pdfIn PDF document text
    • http://healthywithhart.com/res/file/sajivabipoxemenumo.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e05bca75b---zesapuz.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/kizerojoxamulajuv.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb99f81509---gepevolulenowefabe.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/reriberetixuzoziki.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/65404801096.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/jumabari.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160907a44c0501---67907915627.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/2f8a579cacff567a4c895197686e5c77/42574319232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=harvest+moon+tale+of+two+towns+walkthrough+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_off0000d0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A3 11188 bytes
SHA-256: f23a744e5d681425395ffdb91bd1797714041f477dcc1576ec50f7f5877e05c5
font_01_sfnt_off0000ea79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001028b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028B 19380 bytes
SHA-256: a9da35a69aa5f7cc9da60b5d0097b0d9b6c612a2ce4a5204491be4967f7feea9