Malicious PDF — malware analysis report

Static analysis result for SHA-256 20244921cea09112…

MALICIOUS

PDF

73.6 KB Created: 2021-09-13 00:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78ecf2dc08cbf204f3668eda0eeb0697 SHA-1: fd04193972c302b191ea889b529a8fab27338c98 SHA-256: 20244921cea091127f24a72f9310b00925873ddaa5861e9456efaa4f952013ed
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=bird+call+app+for+android
    • http://matfreklam.com/calisma2/files/uploads/waxadagozuzepiwatiw.pdf
    • http://galeriejacqueselbaz.com/userfiles/file/49058361721.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16130d9411f2c3---8530131316.pdf
    • https://masukpt1.com/contents/files/bidanuxepujuxilipizututo.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138a279e5636---25590123963.pdf
    • http://avtokit116.ru/!upload/files/43351143761.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///2021090852657_1038316015.pdf
    • http://e-junghan.com/userData/board/file/ligas.pdf
    • http://nc-israel.ru/upload/files/zazawezuxo.pdf
    • http://roocenter.ru/upload/file/8221276556.pdf
    • http://vladekoservis.ru/files/mugidulixopumasuwuguda.pdf
    • http://rsst77.ru/upload/files/xubajebibasuxefudizasipip.pdf
    • http://avalon-essenzen.at/userfiles/file/84638454389.pdf
    • https://seikai.jp/free_images/files/junowubovisikiweburof.pdf
    • http://zhhyhb.com/uploadfiles/files/pixidapitigikezid.pdf
    • https://sangolongphuong.vn/longphuong/news/files/17119023113.pdf
    • http://coffee33.ru/archive/file/varuza.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/5o5q935ktset0apoip4tmggngf/73159184870.pdf
    • http://teamtrinity.net/trinitya/file/jotexetusuxizawe.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5f202fb60---buposomukolikobax.pdf
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/wipopunomovutibodogov.pdf
    • https://falconshipping-uae.com/userfiles/files/xanabafuwobixexariwefemi.pdf
    • http://nasfthr.com/userfiles/file/bateguxajewopajerogujugu.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_off0000bdd7.bin
403c7f94929a1684591c1173d9a26dda653329833d3495f6c251b944b1f5b4c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD7 10268 bytes
font_01_sfnt_off0000d4f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F7 16792 bytes
font_02_sfnt_off0000ed09.bin
01fb397772ce1b925121753c30e0b23dc742425930b88eaba390ebaf253880dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 17280 bytes

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