Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ab445946e0521c…

MALICIOUS

PDF

89.6 KB Created: 2021-09-09 11:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 488ca93121aa7937dec62218679bbe37 SHA-1: 32927b20459e6ad727dfeb8f0582f25b544f9155 SHA-256: b8ab445946e0521c1f1cba569e14a6ba228cc2189fd75dac95858bce53faeefc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to external websites hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further exploitation. No scripts were extracted, and the document body was unreadable, limiting the analysis to the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irollee.com/userfiles/file/xariwurogetewifiwomogu.pdf In PDF document text
    • https://petikdaun.com/contents/files/luvolif.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/wodemiwudav.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/8109656370.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/vebulakis.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/sefivobelaseziwalibigadon.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69642223551.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138fe282caad---2283331835.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/fotitutofedilifewukago.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/vofoji.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/64303761778.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/63935180019.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/74134047040.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/2958199663.pdfIn PDF document text
    • https://ottopianos.nl/files/482239977.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/durerobojabemasu.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/37932093453.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/89403860623.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/kelawupepezoz.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/50190220610.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161340a0912171---60042047780.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d5431547a5e12ec93ff749757470c64a/notiguzilalujolaripigu.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/5978256053.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/49183705778.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f5289715ecb85d39b26d88ea8fe7c48a/fatotijijujevuxuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+croods+2+pelicula+completa+en+espanol+latinoPDF 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_off0000f495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 19320 bytes
SHA-256: c4af2d68f217bbf9e9ef7cac0b4373643a2c2fcd8a10f330a41ab0488aba8f61
font_01_sfnt_off000126a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A1 10960 bytes
SHA-256: b7758ad722ca2d95c962e42c011dfa68effba2277609a6eb2b3304c7b0628cc5
font_02_sfnt_off00013fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1