Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f56a1a6ca0a06a…

MALICIOUS

PDF

87.0 KB Created: 2021-08-10 20:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a65a826376302c1625c7099e8ff25aee SHA-1: 7cd9ec104d1ce723b5fb1ea499b00afaca04fb37 SHA-256: d2f56a1a6ca0a06afd7c60a4471ec3a12eca81376b5421997fd102e921e6cfcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.annaleehuber.com/content_files/file/navojolebo.pdf
    • http://goldenpoolandsauna.com/user_img/files/jopelalumoravoju.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa999b90dde---xufuvigusa.pdf
    • http://kwong-cheong.com/userfiles/90168331298.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/38798734524.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/4c0497a0accf3d43b1e667729a3e1fa6/88328100459.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5da9ae8068---tugowuluze.pdf
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/lejarizuvedudemiwu.pdf
    • http://kahsport.cz/userfiles/file/gakebotuda.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/us3ql7m34kg18viiokrls2252o/doxedowosizew.pdf
    • http://netpost.vn/upload/userfiles/files/sokijozorowogovidin.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3a61f623e633cdbcca70b4428bc34286/4912232500.pdf
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/lutipemonuzizexepap.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/9425637126.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160adcf07b5053---33411027219.pdf
    • http://crmloccitanecr.com/campannas/file/bezul.pdf
    • https://laser123.com/geektic/files/26933401731.pdf
    • http://ashole.hu/UserFiles/File/luxidefifeworelugidojibiw.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160abd7983fe99---88152647243.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb5f51fc3---xazuzawozogetikavefaja.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/035587751057200110912a8fcf18835d/53091629250.pdf
    • https://worldcastlive.com/userfiles/file/69002887441.pdf
    • http://passionsavannah.com/clients/0/0a/0a61c075fa1d7d91f8ce2ef588f7e9ce/File/77371976819.pdf
    • http://mamaskitchenorder.com/uploads/files/kopozexuzixofimenobut.pdf
    • https://irisapp.cn/uploadfiles/fckeditor/20210803/file/16279576579109.pdf
    • http://www.logomarcanet.com/userfiles/file/55925990050.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/d487c69f740488e0aef5533768fec08f/31476426440.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=tipos+de+contaminacion+ambiental+causas+y+consecuencias+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_off0000ed47.bin
077695bddfa8a0d9dda50193f6e867352533ab9f32cb09297d394579bf4a0254
pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 10996 bytes
font_01_sfnt_off000106a4.bin
8066fa8c9feee90299066b3c8519b60fa74aeea2c254532045c2260b9479378e
pdf-font-stream PDF embedded font (sfnt) at offset 0x106A4 18360 bytes
font_02_sfnt_off0001358b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1358B 16792 bytes