Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd2ede4b4c88ee8…

MALICIOUS

PDF

99.0 KB Created: 2021-07-13 08:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4136c9528aad31f7377b6292459fecaa SHA-1: 5862bdb8d17ddb15d6a3a8764b1db3de3718fa14 SHA-256: 6dd2ede4b4c88ee84f61e4acbbed98ac17dc6c42e8342b72f8076c3f0d3137ad
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or further compromise. No scripts were extracted, so the primary attack vector appears to be the embedded link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/4o9528p23aiue5e1f4ukea9q8u/mosemulosevuduwe.pdf In PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/b3a087fb7a060c3682d9cf1858c430ae/62979963135.pdfIn PDF document text
    • https://led7.ru/file/xovepulawexaxiba.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210613_CA5B384DA350139D.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c51d180a28b---21471088314.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed7917bec7---xuwifizoridalogavosimaxu.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7d1ca18bd---zumegilulidukisa.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/telolarab.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/vebosozowimuzenutit.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/vomebaj.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/a0ib355urfh374a2q83pr9orm3/48561518242.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/36242939504.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/tixuw.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/wawarolu.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/4560666271.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc30c61ec3---jilivazaxujovobix.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e88571bcf5d---46330674891.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/gusokokaxudawexadupelu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/758b9bb24a432877cc0f820b2623e681/41586842960.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/gidonixabumugifipozuxam.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1620876100.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/fvmkrj9gktia6uhd3vi8qvdub8/42997830786.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/2mjqedbd9vqhf3e9u61tjm4930/kezubafugatu.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/jaromifok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=me+before+you+yifyPDF 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
stream_002_off0000f722.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF722 21616 bytes
SHA-256: dfbcea505b05b091f2c9d8c89b373f9c462916ee957d5128608d8f7eb33fa5fa
font_01_sfnt_off00011c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C47 19412 bytes
SHA-256: 81e12830148ec94146ec1f7fba183b7fad23437f84de27ed2029993a0418096b
font_02_sfnt_off0001501d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1501D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16833 9976 bytes
SHA-256: 40e6c8430775523773126d0603bb57f9265ad27e2e3167280ed6e3f35caca6a5

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