Malicious PDF — malware analysis report

Static analysis result for SHA-256 0155e68907dbc65d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 17:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0bb102d3df4a96738ed6f980ead03948 SHA-1: 9b8ccd0e643b3d52735060ea13d1137af6fb2e9b SHA-256: 0155e68907dbc65d65aaac52605399b4a9d1235c528ccf89ec8b8b9a4275491e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://daks-96.com/f/uploads/files/20772088626.pdf In PDF document text
    • http://maroba-zirndorf.de/file/51553628541.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/luvopovuwije.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d27fa54178---21056202472.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/65376176234.pdfIn PDF document text
    • http://master-vin.ru/files/file/1404935516.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/jabofabo.pdfIn PDF document text
    • https://architektor.ru/uploads/file/42043115384.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb0f0d6b53---lemaxunutizidasefokagu.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/laziwemezo.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/jovogopuzefujilefowaletig.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/53829111008.pdfIn PDF document text
    • http://pasaru.com/upload/files/vopogezowulogaj.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/68710972896.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/14085381423.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/wojugunajajud.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/16482732123.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/jolugafifutixo.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/76327530565.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/jovoxuxafenomimi.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e21b449334---33789758167.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/38891250675.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/48971353586.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/92882945631.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/pisulamupenokenutepasi.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/75866969255.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/59305135323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mod+menu+ps+team+free+fire+2020PDF 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_off0000de2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2B 10948 bytes
SHA-256: 7958f612946bd4fd5388dcca17e358bf0f41d272fc65f3b05fc03e28e282d6dc
font_01_sfnt_off0000f791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 17852 bytes
SHA-256: bbcfe78d5efdffc860d174051b3eaa96ef4dfc77d06321b1560f068500eac667
font_02_sfnt_off000125a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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