Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2231f4245cf0f6…

MALICIOUS

PDF

71.2 KB Created: 2021-09-03 19:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6831ce5e7be70c495d8e835bd15a2350 SHA-1: 45590884f43a99ec13a3f4132c9ece3ec267dc70 SHA-256: 5d2231f4245cf0f61ca0d18d1dd1302403cdc5e2c27682c17754f16b214cb5f3
156 Risk Score

Malware Insights

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

This PDF document contains a link farm directing users to multiple external websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. The primary attack pattern involves exploiting user trust through a seemingly innocuous document to redirect them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/384cfda4ad46a011d5d606aa9bffb3f1/monejopiv.pdf In PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/4501f2e84fe221a1656f855a86c9402a/77217292520.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/9912765290.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/lubopupetisijinisufuwin.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/r05643sbo2298gv2mjvtlqealh/90822045472.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/mebiwagoxum.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41c4ce427---84403824275.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/xikolukemo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774dd36f3b1---xufumak.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6733c0349---84825759188.pdfIn PDF document text
    • http://polipack.ru/content/file/gowavoxomojememoburubef.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/pazifosilopogum.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bea4b4293ac---xarupapuzuwinogafudazijo.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92c7433296---zudidijowegelasi.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/rinozujimerag.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/wezato.pdfIn PDF document text
    • http://mobilenmr.com/files/files/81254519013.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/fevurepesakoxitugebokojos.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d3bbf1593391e82e86a2dde840ff9b9e/tovejimoxoruvodunobujak.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/runedukili.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/eoiod5h5vj8kei9u8ciapt9d9i/rojapukotulanodu.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c28d3b2bd02---fipawasifewazowifimofi.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e128b1eb0---zunarudatujigofu.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/texere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=rf+%26+ems+beauty+instrument+manualPDF 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_off0000bb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7D 15992 bytes
SHA-256: 48b480bc0ebe270f2e5307d5b4ca6a56211c38058bef90cc218048a32e26bd6a
font_01_sfnt_off0000e3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FD 9224 bytes
SHA-256: 9df102113714b364719ab2b2a9c78f66d0f80cc0da17a9ebf44577c793587b3b
font_02_sfnt_off0000f754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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