Malicious PDF — malware analysis report

Static analysis result for SHA-256 f919cbb21aa89ea9…

MALICIOUS

PDF

91.6 KB Created: 2021-06-29 22:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0c480ae6fabf666fc445fe2dfb0eee2 SHA-1: e5769598aef0b992e4199c6a628fd7f0f4298331 SHA-256: f919cbb21aa89ea90d67f5918044f1b7d87743edc27bbb65bc952fa7f7f0e58e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads 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 malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=mrs+paragons+home+for+movie
    • http://lapenya.cat/imgjovesnaves/file/gewemifemafopajalukigixaz.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/8aeletd5ebuu48ucouc4mg6667/dakivuwejeb.pdf
    • http://oio.cn/uploadfiles/files/23399691577.pdf
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/wonavu.pdf
    • http://www.irrv.org/uploads/files/53548595246.pdf
    • https://nutricount.cz/UserFiles/File/pitalalunus.pdf
    • http://jaika.in/images/documents/files/povijuwikinakixogi.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/1f6c857a87c541e3101dfc751af1752c/lozavowukizasiwu.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1ad8070a---92697185738.pdf
    • http://fritz-fahrlaender.ch/download/kuxobagunisupunog.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8742781e41---sokokebadufepiji.pdf
    • https://stdtekstil.com/upload/ckfinder/files/fulogasu.pdf
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/wajebularesovivobulakapov.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e0d07b21e0261b839afa67432c779cf3/jugofodoputaz.pdf
    • http://weberstellen.ch/userfiles/file/72246309205.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/43307a03b7d1c2fc7cff0a5a6bbb5d4e/18304447664.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/a98fa8e1921dee5e51044b3c4b51171c/fibolotikufizu.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a8b0805ac---wujoleba.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746172e5022---64458911029.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/bb075eef6c2f57ba946da2d3ff142e41/87196967756.pdf
    • http://sklepjola.pl/userfiles/file/81961354276.pdf
    • http://volvo-cars.jp/js/upload/files/zazan.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/0060hggglgtr76397hukia9a51/54861584684.pdf
    • http://stonebreaker.at/fakinamedimifuvikewokun.pdf
    • http://palyavalaszto.hu/teszt/upload/file/54712571151.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/58ce22ec3e79d0c03f17e5ed783ec0f9/2968802246.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_off0000ffba.bin
e3384d9b64a5529f39bd0875a48fe05730b417adcd43ee15e70af153a54df470
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBA 18036 bytes
font_01_sfnt_off00012ef2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF2 16792 bytes
font_02_sfnt_off00014709.bin
64eda46c8fca29eb4cd0133f900f5487840318f2fb40e5eb60316b9f07aa8a78
pdf-font-stream PDF embedded font (sfnt) at offset 0x14709 10720 bytes