Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5cf24d2d7a430cc…

MALICIOUS

PDF

61.2 KB Created: 2021-09-06 18:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9aabd7793c1ec0d56b8155e8c348e79a SHA-1: a5f06ddd1f3131408308e5a44f4b954b8dd340d1 SHA-256: b5cf24d2d7a430cc5e466851032b132f6d4d7af0a4f1d50fc124fa3f87ab92d9
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Some of these links point to compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8187

Heuristics 5

  • 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
  • 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://aawyx.com/sites/default/imageuser/file/48721542643.pdf In PDF document text
    • http://assushop.com/userfiles/assushop.com/file/jinubanasezijikibuvi.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088f398cff92---26681720310.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/9226054386.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/c7b5b3c724707d8401c2952565da894c/81643783031.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/fuzibapukorapekitigile.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa97cb1a0a0---7144249389.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/75471709043.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/73134123438.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/15468838777.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/dezabunusuzavol.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/lunezusawimivamawewiw.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80205192773.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210803180114_z5dnpd.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/6192593822.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/44697178524.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/juh1rf6qvatg0g6vgf42sp3iam/56159589400.pdfIn PDF document text
    • http://contextuae.com/resimler/files/juvesopa.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/88485777918.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/waxenevar.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/vizuzajinatuxalikekap.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/fojetupoxipetab.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/53e078a65661fc806161eb01c33635d2/52960815822.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/fuwof.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160acad076f77d---gafukevuzuwemuboka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=50+tons+de+cinza+pdf+online+gratisPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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