Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7a84e3e11e771b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-21 18:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f93ccaef67036d7e9543dc4f83dbcbef SHA-1: d5b67e7c745908a80fbe6f73622b78e6f0be6d86 SHA-256: 8c7a84e3e11e771bd89d760d12b4bbd10ec94b80585d8a6b6d3bc826b0a35b4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to lure users to external, potentially harmful, websites.

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 https://wastran.ru/uplcv?utm_term=notes+from+iphone+to+android PDF link annotation
    • http://planao.com/ckfinder/userfiles/files/62809212013.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/lirene.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/51481346855.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/13235825735.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/wonomigabogemakijusadujo.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dcb9bbb46---kotap.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109091214328305.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/30029190080.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/rilajemix.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/zuluribexugosobelinada.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/38079790510.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133345336431---zutaru.pdfIn PDF document text
    • http://gerocuki.hu/user/file/72434708978.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210907123236_1057270535.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130255628d17---82671263434.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/semuwanoluv.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/94438228119.pdfIn PDF document text
    • https://atrax.hr/files/nesusega.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/fibaxumeten.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/lozikekalavagak.pdfIn PDF document text
    • http://mopron.ru/upload/files/xefopamizunukabovozixe.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/suwovul.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/75735880552.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/perigosejevovir.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/74155636198.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/3736edbdc517c5573138b956a2582b3b/vumebazono.pdfIn PDF document text
    • 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_off0000d467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD467 10696 bytes
SHA-256: d579a3a795fa513c7c955ced4056f7907f75acfd290263011ae43680f293a4c9
font_01_sfnt_off0000ecc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC3 19348 bytes
SHA-256: 3b7093d7239bcfe175ec9111721f01d61fd76d8bd8586f51f367610287e260c3
font_02_sfnt_off00011ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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