Malicious PDF — malware analysis report

Static analysis result for SHA-256 798602388f588856…

MALICIOUS

PDF

86.5 KB Created: 2021-08-20 16:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3617676d5d044482172663fcc3729f35 SHA-1: 5ade7a15349ec3dd2b7b5d553c6cbf34e2f108a9 SHA-256: 798602388f58885661f898a8a0c7703cbd13a9b3a1c2a7a9dc4de306756bf250
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure victims to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/bakimajurak.pdf In PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/09429c58fe54a60fa2154429fe4f0a9d/9319153183.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/kodijunarelafonataf.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/negagodeluwemepam.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2ef10881c---10781356668.pdfIn PDF document text
    • http://jsdarvin.com/files/fujesupama.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad7e8b8f1e---kaxojojafisag.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/66467439697.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/kschmc0m4pnhjljohh7v3h2ef3/kuwubigikitibuve.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00d8395ec8---70420476458.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2b1d4318f---jejogewezokalamugade.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/3199f1f013fef4efd5f2c5f19fbbeeba/77675667895.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/36960203351.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/65454176610.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/xijozujobexetovusise.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929abf94f46---29994440600.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/zetiribelekakixej.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9710aed4cc---mafejiv.pdfIn PDF document text
    • http://www.bash.cl/media/file/bexipijopojeter.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-29/20210629121434801264.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/43012455255.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/2ffdacd3cca09ffabf3a4b71a44e78e8/74455585233.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a2417671d9b---89886020931.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161086bbeb0335---muzel.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/jagagekapupobagewona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=tabla+de+densidad+del+metanol+a+diferentes+temperaturasPDF 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_off0000e651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE651 10864 bytes
SHA-256: bfdc92905feb90cb8217bed6d8533105536788b396b0a6cb5eff8d1d55bd87f8
font_01_sfnt_off0000ff29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF29 19380 bytes
SHA-256: 129cdab5ee57de5a6f4f7b7d7db2b0da6b4350040a2a39cbc611d740c1e87d3a
font_02_sfnt_off000130d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1