Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdea1ffad4771019…

MALICIOUS

PDF

90.0 KB Created: 2021-07-16 22:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f8aae9cfde11873f1ebbb5682c0095c8 SHA-1: 03efc3b7b0d8b5545c93721ecbf49afb21701d43 SHA-256: cdea1ffad47710190040980987420e07fff97f14d69b16204bdb237b0258a917
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. The embedded URLs, while some are marked benign, others are hosted on potentially compromised domains, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/2df785bfa51ded5d6e89034dbc8c1f9d/gojefedorokowizeze.pdf In PDF document text
    • http://studiolauramoschini.it/userfiles/files/mapovikuno.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/ruzujologexawolose.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad07e655a---58611628429.pdfIn PDF document text
    • http://charivne.info/images/file/64828376063.pdfIn PDF document text
    • https://brakos.it/file/fepakezegunuxi.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/wumijefimekafowafabimo.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/togilikikosabozilek.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092a82a2c250---47530489109.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/26043396885.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f71164879d---tovavexukesa.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/monudadipakugomutubesesa.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/xadote.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2bbe14598---86994695918.pdfIn PDF document text
    • http://aven.su/userfiles/file/57040330491.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/kemesinunapugademadogawo.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/xubofugo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/11356194590.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/mekonupapar.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086de2a6e4e6---83881161890.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a71b3d3b1ce---70646836335.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a93cc377d---99871977881.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608578faf3f0e---291900516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+set+up+template+in+outlookPDF 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_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 10584 bytes
SHA-256: 1ce0a50cba310251e8cc969270540a60dfcfb7839b374458e2d9315effe64bb2
font_01_sfnt_off000113ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EA 17700 bytes
SHA-256: aa8d83bcfb9e1559a725258acd4558b8f8053b01367465fb4ee804d6382b07b7
font_02_sfnt_off00014295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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