Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b99fa3671540738…

MALICIOUS

PDF

86.8 KB Created: 2021-08-13 02:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c5f25b10caf8d4e8ebf18d40e41abcc1 SHA-1: 2264806d004669a22ebcd4a02bed1af1e0fcce70 SHA-256: 2b99fa36715407382464147418ee8ed620cd56acbec35a089df584c7ee64f962
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads and 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 delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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 http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610bd26cd836a---mometinusebew.pdf In PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/b457c74da3bf13322a93b88333dcbc89/12572134830.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/80418748881.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/sugiwodadadilifulo.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/74398152310.pdfIn PDF document text
    • http://policylic.com/uploads/files/94510784977.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/46704703266.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0c990f978---zokoso.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/43446344691.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/86819307175.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/uhfmp2jh0e34gcldp2lpde9i8h/nejemomusovinazivoderatuj.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764bb97505c---95761750891.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/bigej.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f0c507d9e964af5622d14c947f71ecc6/xakamunem.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e071a227ec---96962170686.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/3gi10c81v9irkmsmecb9g59jj1/72299412134.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/ceda365d3fe7d02e4457532500982291/99998278730.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/92264025672.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/56075984025.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/77466466468.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/29701883803.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/mivugodanokugenafabopeso.pdfIn PDF document text
    • http://coffee33.ru/archive/file/girizarizakode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=hannah+montana+the+movie+2+trailerPDF 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_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E3 10380 bytes
SHA-256: 7792aafe3b1875cae098077fe1ab63f05b69972dd08bcd559a583ccac194516a
font_02_sfnt_off00012019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12019 17420 bytes
SHA-256: 842033e4635250608437dccf6bb228e4b9fe983a16ecd93c41f86f8dbdd84d95