Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1934ec9ad9ec11…

MALICIOUS

PDF

76.4 KB Created: 2021-08-09 11:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 36b435097a911ce91934330cd95ef554 SHA-1: 61c846cf65e44036db0f195ce442e332a33bc0ac SHA-256: 3e1934ec9ad9ec1102999455d6d44eda824b2b0d2b8b8b27d15e2d4e87ea0c5b
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://portalpr-b2b.es/img/user///file/_0722721001624793085.pdf In PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/komuwosipivez.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d316e6dcc---20959486342.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/kujusapalosebitikoweli.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/46255472994.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/joxipuzeg.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45cd8ac23f---vutosifugaxazupexixu.pdfIn PDF document text
    • http://satbietthu.com/luutru/files/zokesu.pdfIn PDF document text
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/senepaxibogumeladitofuv.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/fabivura.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/40981722874.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b028b67889---bilaxabosovebezamef.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/pvgg9oqiu5p4l7q0qarqvuvppb/bezawupaxoweg.pdfIn PDF document text
    • https://baongochoa.com/upload/file/78417628532.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160da1a5df234c---96972315097.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/libumusatosu.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/dut48uhui007mknhd6nr2g3ot2/rubomoburexefotamofuvare.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e014f7c36f---13535503909.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c58028a970e---16713679910.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/11491477457.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16074963611a82---suwiliropagoveduwe.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/65845900677.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079ca71307aa---51781428315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=coop+%26+cami+ask+the+world+season+2+episode+20PDF 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_off0000ca79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA79 9368 bytes
SHA-256: 754ec567a911744ab90905adfe77aa9db9e6eb9219e42a6700010803af22cc70
font_01_sfnt_off0000de66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 16964 bytes
SHA-256: 431063fe29f30e5ff74fc0a4efb93b417268a7891ac2abd2979ba707f36e869f