Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa725417cf141f90…

MALICIOUS

PDF

81.9 KB Created: 2021-07-15 17:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6485cfff0d4acb989f15c760458f1e33 SHA-1: 978950c36a9284f777f432abc96ab6680d7804e5 SHA-256: aa725417cf141f9078623231db3ae5eb89243f61831debdbcc7e68076eda1818
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted from this sample, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://inwebjor.ru/uplcv?utm_term=iit+jam+mathematics+previous+year+question+paper PDF link annotation
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160871b78d3e04---74453970805.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/pugogilaw.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf9f381725---kojawomiresofe.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/9780219715a515da39d4243962320556/loxibefopuwonivisedapi.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/79539932955.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8129d8046---zumepiduw.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/fobowedik.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/fuxuse.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608507af21eb3---wodiwixiwavupo.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/wezulogaloselokikapud.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/45457355288.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/28539357535.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/6b0292d3ef5086ffabad28791ead5b51/25672158836.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/66561480648.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/fulewozopimedulejivifiluk.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/dcf5f45eec237d39e00e61ae054b6e16/gijisazegutuz.pdfIn PDF document text
    • http://waltripclassof74.com/clients/8/87/875eff38522a6836d9fda94c5a2b6b26/File/31271643088.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2b9aceb03---kajuzib.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78d9a58707---zidupisagejotajurati.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928c82327d7---kupufutiduk.pdfIn PDF document text
    • 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_off0000dab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB5 16852 bytes
SHA-256: 13e9a3975253e8a635b56b2d49f23517fa1b8d86c19516d266781d7ae3d39510
font_01_sfnt_off000106dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DD 11100 bytes
SHA-256: 5519cc329e1f111320e0f53e18af2504243727b87931bd925b0b1b6229d80c45
font_02_sfnt_off00012092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12092 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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