Malicious PDF — malware analysis report

Static analysis result for SHA-256 128b8bc01149ac75…

MALICIOUS

PDF

92.4 KB Created: 2021-07-02 02:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6b6de68bd1d977320dbf89e1e30a0b26 SHA-1: cc7c2163d0ccab860ec7229812719a28acd5cb48 SHA-256: 128b8bc01149ac758bf7c512ecea12f47e1cd684bfefe08420336980cfedb35c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristics and URLs suggest a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a02e909247---xovosesekunikagukuduzajom.pdf In PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16084da0b88308---93912819051.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/dobepeperefotusedog.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073640a46fb8---nusedakawi.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2699a6087f49eeae739b016e7e4cd567/80818893821.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/51045964376.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2308a1877a---gadawawox.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ec46765b9---41688015858.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f513eee725---69123795004.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/wogomig.pdfIn PDF document text
    • https://unosms.us/userfiles/file/52797208944.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/l2l88in3aohmlpbpveue4ckm98/8439871162.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608eab04b1ce4---18975416340.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/pidom.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/h187evu32kqeusqim5d96tf6k5/82719793680.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/megejilajepefefur.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/bowalivonilugijul.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/kifibomuleja.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3768d04010---rosusaxa.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a14407661---bapogozesoxolavifoman.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/56e856911777e18456d71af6247cc86d/53731238816.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ec459856---420041664.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/93192137065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=red+bellied+woodpecker+floridaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10408 18292 bytes
SHA-256: 3857b224a0313053aa5bbaea11c025476a6023de7bd6fcb43c779d67abf93264
font_01_sfnt_off000132b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B6 10608 bytes
SHA-256: 7307efda64ddde0a41775307c89f73e15c597039033bd7bc54215f56dc6270d9
font_02_sfnt_off00014ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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