Malicious PDF — malware analysis report

Static analysis result for SHA-256 f179d24acda100af…

MALICIOUS

PDF

83.1 KB Created: 2021-10-05 00:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7126d0bd27c0254f8910cbb39fa2e10 SHA-1: a6e619c04236d7acb77fe9eb34a0f1aed9420242 SHA-256: f179d24acda100affedf5df8411477b6a70a215340e17914ac98828e301bd1a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://hotlinepro.in/admin/userfiles/file/rukerewiwawizenigerodosez.pdf
    • https://livres-arts.com/ckfinder/userfiles/files/73596932835.pdf
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/19216525468.pdf
    • http://yds-wcv.jp/free_images/files/42286126927.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138d22c6b834---volewumexeler.pdf
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/korufodelajiruvopitafudo.pdf
    • http://brainbond.ro/userfiles/file/rupumolunadomerutaxeduzer.pdf
    • http://kstarsmall.net/userfiles/file///99183719364.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/3232c276aa484e2d7a20104a886ce781/73045501103.pdf
    • http://prvugkh.ru/uploads/files/sawurovadojeliwudomebo.pdf
    • http://www.findvoters.com/userfiles/file/kakenoxovimajalo.pdf
    • https://ghnservizi.com/file/sofif.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a6b9a2051---34097005258.pdf
    • http://3gr-group.com/ci/userfiles/files/pudesiwupinule.pdf
    • https://knurussian.kr/DATA/upload/files/202109032350247760.pdf
    • https://at1-turbo-j3t.com/contents/files/wijexal.pdf
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/64624594931.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/3f549c3172fb714b601ba9a15704167d/13181355593.pdf
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/70079292170.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/90b032e012d41c78c0d3c5b89b587364/wosamegobuwunofat.pdf
    • http://vallovin.it/userfiles/files/47229236867.pdf
    • http://studiotecnicodama.it/userfiles/files/88597073225.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=man+of+arms+reforged
    • 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_off0000e2c2.bin
4ca2d13be97b38c7ba0abc23a55e42da64179a0c4bee2f68d278dbbb96f75ae4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C2 10452 bytes
font_01_sfnt_off0000fa3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3D 16792 bytes
font_02_sfnt_off0001124f.bin
f4c7acfdea8ea5eaefe2f24b9299280e55659942fd1f872429e9ae6477f79298
pdf-font-stream PDF embedded font (sfnt) at offset 0x1124F 17392 bytes