Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e757bc5ad6c1bff…

MALICIOUS

PDF

85.9 KB Created: 2021-06-25 23:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43cad4aa2305e90fcf09bbba54ff461c SHA-1: ccca6a60e539511485e29ac5dc71950f3a9d1c87 SHA-256: 2e757bc5ad6c1bff7a5c7a9ae126fc324df28d9530d9b98ae15a05789d81fd25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with common techniques for luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://archism.ru/uplcv?utm_term=guinness+draught+stout+nitrogenated+abv
    • https://rozgarnetwork.com/ckfinder/userfiles/files/fidodozefisedej.pdf
    • http://yao-cheng.com/uploadfiles/20210618143134.pdf
    • http://generale-bureautique.fr/gdb/files/file/xunopofazerujebiw.pdf
    • http://asianmosaicnyc.com/userfiles/file/ziwobo.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/2d6b8a1a97dfd63fbf915e68b1b4df02/44389326048.pdf
    • http://apexibd.com/uploads/fck_uploads/file/jetilegiredesujujugu.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c64d5bb4d11---12334332221.pdf
    • https://agatanorek.com/files/file/79561352901.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b7a5527d6---zalesuxuropakixivavorojab.pdf
    • http://kaowei.tw/image/files/20210601_200347.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743b5f32c0d---16963123292.pdf
    • http://fenotropil.ru/userfiles/file/miderefafimuxeb.pdf
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/20617338906.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/79823390568.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/cd4eeca6a76d9729dad04c0155080c6b/xafutetedop.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c67bdfdfe83---pegumopab.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cc60c592e---mujowimatojaziro.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/j5c9qv3f7mgj1lnn4qguem3mo2/genegisuxizopisu.pdf
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/68bd18b5efc677f49c823e660c8abbd2/9645278330.pdf
    • https://audreyheselmans.com/_files/file/fitadivodudadopepixi.pdf
    • http://pnktools-th.org/ckfinder/userfiles/files/3285932706.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d0e8b1195---folikimaropananivilojopi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e93c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE93C 16792 bytes
font_01_sfnt_off00010153.bin
24c7024375a47f5ed07bb8a2fcc55c4f07f10851b9e75540d2192a6250f4a87c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 10824 bytes
font_02_sfnt_off00011a0b.bin
775a7b7988ff19f49a65d2cddebad49f9401de147e58449feffa855a382381de
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0B 18816 bytes