Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b1cc57b48c1d52…

MALICIOUS

PDF

85.0 KB Created: 2021-08-15 23:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 10d38d7e0bb5f39a6c4f3a7a7dd016a2 SHA-1: ce61a532eb999688460ea7a1fd035095ed1e4d50 SHA-256: 87b1cc57b48c1d52492a6df5e3603ef371d2b7934e497048b362a9005140d3de
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other hosting, likely intended to redirect users to malicious content or phishing pages. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/928155d8c36214bae7edcee6f5c1d4a8/38899891709.pdf In PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/bc089c554219a14b6ab7735452b785b9/4749458883.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5b2e30688---22360071578.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd7428c654---63553729603.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/jevipobipavutof.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wururiguw.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/f1a032025702c5998b67acd8ecd102a6/dopajipagazefazatopu.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/dikufenamokipomafaj.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/79526696934.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a16b621e7b---91297951092.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa314ba3427---bexitadujive.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/68662570766.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/1465013640.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/juleroteve.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1d7b97e84---zuzinakiwatuxegowiza.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/4158750a9e7aa42384473e94fc5cbd08/51757233695.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f9b373f67---62410115544.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160beb37d94794---30774635080.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/11419516020.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/pinegotawidexobatez.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/59845267483.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/3v3vmc4pl8rafst2tc2tnvnmqi/zopamu.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811d663caa0---koseludowaze.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/78997774784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=plantronics+cs540+headset+bluetooth+pairingPDF 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_off0000e115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE115 11368 bytes
SHA-256: 033c74e315d1cd002077da792c63a51046d5441e5144c627d7ee69e704d1b9ba
font_01_sfnt_off0000fb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB69 20048 bytes
SHA-256: ef3697a38a616a8e14ae8585727a0121b010c6c98d1f712b5bb8e86f8b06212f
font_02_sfnt_off00012e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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