Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ed74bad396393e…

MALICIOUS

PDF

87.1 KB Created: 2021-09-11 05:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8b3a10292dc09cc9c3da67a4a81ba5b SHA-1: e986d83e3ae542c532303a319e854f9456bd1b9f SHA-256: 98ed74bad396393e23767f9ba66eb5a1b675dcd6df0c6c89d64fd103844e38ce
96 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 or disposable hosting domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to external sites, potentially for further exploitation or malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://webbyshoe.com/fckeditor/userfiles/file/ragiwi.pdf In PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/wigupifilupejiwu.pdfIn PDF document text
    • https://spacio.hk/attachment/file/jofubozasog.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcad47273b---93504055810.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/titadi.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210903_36A6A5D2A1276852.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/84654568758.pdfIn PDF document text
    • http://josquin-capella.de/download/84091057649.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/mabemikapagapelutupabep.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/19299781136.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136571e135c4---89340649767.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/20552266364.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133bfbcba9d3---5722224260.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109020337574896.pdfIn PDF document text
    • http://kodemari.info/data/files/liwejodo.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/lumigomuk.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb984c87ee---lonadiwufeb.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/pomuviwiviragol.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/vazuxufiw.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/51738193920.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/24599198741.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/katot.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/sorilufube.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/67408605544.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/bodowubagimufiviworef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=g+string+bach+pianoPDF 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_off0000e616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE616 10652 bytes
SHA-256: b5ace28d17bfd4fe6a1c6448270dc17d734fea26de0761371e85e5d133074d56
font_01_sfnt_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 21676 bytes
SHA-256: 2ceebc6e26713cedc6782b8fa715a1325948073b25a26902ffedaf07ee91d633
font_02_sfnt_off000136fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1