Malicious PDF — malware analysis report

Static analysis result for SHA-256 968f3ec22afee53d…

MALICIOUS

PDF

88.0 KB Created: 2021-09-03 20:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 674636907b3066eb1af2c39ebc7459cc SHA-1: 46792fa6e9ea1506edb807188e1747f7a850de15 SHA-256: 968f3ec22afee53db3ff0d9d6f55d0ef432787b3777d6af57d2342b4044ed3ba
96 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple compromised WordPress upload directories and other disposable hosting sites. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to potentially malicious content hosted on these external sites. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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://ankamet.com/userfiles/file/26905752239.pdf In PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/37275188040.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/6234316277.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/5fd1fd95ab5e7224f548d1ad18c086dc/41066821374.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16988d3a47---54139999113.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/rugaxugujirizi.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/92937421446.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/13406753046.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/29604486378.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/468d95f9eb690c7c347843002bde2b75/zajulepusavew.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/63091317458.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/xelakebarivo.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/rajutimi.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/50538407249.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/67527016170.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/takunobegeterajenikulolen.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d311ab06---53604495343.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/79913840617.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c162d5db0c6---vanuvotum.pdfIn PDF document text
    • https://termocasasrl.com/file/begikoxutetasavobigimud.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c9d37ae18---45233835468.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b55167a2435---jamigutogiwem.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/refaramexudenovunenad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=wppsi-iv+scoring+manualPDF 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_off0000ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 10680 bytes
SHA-256: 706dd3db8c3e9f748114d06e1e938e8b7d79780f7a5ef081ce1e25148e523123
font_01_sfnt_off0001069a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAC 19660 bytes
SHA-256: e542a6f8d209e1cd1ec32d66d12212051a997099987ef56889b12a6e21dbfc62