Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f6c0dce4f78621…

MALICIOUS

PDF

283.9 KB Created: 2021-06-30 00:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 76e18638b7d682b5f12ce3b612663f54 SHA-1: 95c311f8d6e7d349f773681a8332572e197c55b4 SHA-256: b4f6c0dce4f786218bc1d8a545f8f21a08d45b1c9d1d4535295f40060a5dca81
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to compromised WordPress upload storage, indicating a phishing or scam lure. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' specifically flags this as a free-download phishing attempt. While no scripts were extracted, the presence of numerous malicious URLs suggests the document is designed to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9644

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://csom.cz/wp-content/plugins/super-forms/uploads/php/files/81273e9210038af163458778fbc0a403/37093334504.pdf In PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/45799ba3316333725c5d7908355444cf/laxasijivaxo.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609b534a84e00---60259090228.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070094537420---midomakedonawudadediwune.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/80192899432.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9c82c5e8f---wulopubanesaxugopej.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c313771a86---22351218266.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a240db2fa06---kiraletalasekevige.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a91ccd0d969b6cff4764f44ec3f4717/37602858080.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5901842dc---fibumonamumoxupixojuw.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/5ciellvu9s8jp41dboemd6p72g/30889746482.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a1408165e---76750557385.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22fb8510f0---bazipetomin.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/rfk4b5gveaadupi0d90rsv37pg/kejonewedef.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/tenegopozoto.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160868ecfd65e1---jazuvuzevinow.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/wadogemigasi.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/55497974331.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074f85b9a829---vuzisebojake.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/winolavulonidugu.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/vijovinak.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/bafejere.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16097967b3b3a6---wavosavoxasibi.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c021690652f---79548979752.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/d245621ee034b8088a738b4ab5e69a3d/98665018817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pug+breeders+in+paPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003c035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3C035 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0003d843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3D843 16092 bytes
SHA-256: 7b94b248be932134b3b2bf8835e6c2138979e0a2e01f996fb11788bd073932fb
font_02_sfnt_off000409ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x409AD 10544 bytes
SHA-256: d882cb41c6adda3228a55a5ef9801cb61dce07299662b79952691a65dd14eaac
font_03_sfnt_off00042153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x42153 25084 bytes
SHA-256: 226f53009a4d96b8f0cfd2b56eab2b8953592b9361e6470eb07482e19fb4fcaf

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