Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d2adefb07ad51f…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 00:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd853847306165ef27934489d6d153e5 SHA-1: 4c8424a5c3575979ccd1760c2058fd1b656795e7 SHA-256: 76d2adefb07ad51f8be96e49cb4e7cee642b4919bb35d6f78979470e990632a8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the numerous malicious URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pixomot.ru/uplcv?utm_term=free+philadelphia+eagles+wallpaper+for+android
    • http://anaminfo.com/attachfile/file/rufifimofofuwatigemi.pdf
    • http://bhttourist.com/upload/fckimagesfile/45924495947.pdf
    • http://itemclinicchina.com/ckupload/files/37485561349.pdf
    • http://tasarimak.com/ckfinder/userfiles/files/delejija.pdf
    • http://globalcentral.net/contentupload/fckeditorUploads/organization_/file/19754825046.pdf
    • https://implant-drill.com/userfiles/file/9505401545.pdf
    • https://www.iieng.org/editor/ckfinder/userfiles/files/38908275926.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f883659716---memirexilosado.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/kogititasatazu.pdf
    • http://koovappadyscb.com/ckfinder/userfiles/files/bofimujapijol.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/vnbrq117252470icj1qmd4s3s9/73664033093.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/f4b445510a05e0d4cb94af7f3b02390a/27381319552.pdf
    • http://mastervin.ru/files/file/rutadefufokolorewalulewa.pdf
    • http://eltprof.ru/userfiles/file/88170506314.pdf
    • https://gulfb2b.com/userfiles/file/pabujupowena.pdf
    • http://gazosilikatnn.ru/uploads/files/zedikivonolupafuzenoju.pdf
    • http://americasbestwingsbeltsville.com/uploads/files/10577562505.pdf
    • http://poiskvod.ru/images/file/fifilor.pdf
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/wazuberoxirugomonofil.pdf
    • http://jfe.hk/userfiles/9164430344.pdf
    • https://tempegaring.com/contents/files/53049046985.pdf
    • http://bdpq.hungminhits.com/files/uploaded/files/furigezibukebirelipo.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_off0000affd.bin
6d4aa152c578de4e410b4dd61bd5b2aec236752aba200f7a709695ef5eb88c9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFD 15912 bytes
font_01_sfnt_off0000d8a0.bin
8014c057c2c61b2ba40dfa83ae7bbd62289e0ae7d40c29ef6d945eec840871f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A0 10740 bytes
font_02_sfnt_off0000f104.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF104 16792 bytes

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