Malicious PDF — malware analysis report

Static analysis result for SHA-256 359d8501f68b4559…

MALICIOUS

PDF

87.0 KB Created: 2021-09-02 03:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: be738ca4599f63c47725fdcba967d9f8 SHA-1: abdcf11ba077994be07c45bdc75e656d4b0da998 SHA-256: 359d8501f68b4559bfabb71cbcd404733da054a3a77186fdf3087e70c2163703
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised CMS upload storage locations. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to exploit vulnerabilities or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/su8i2l6ha45unj7qtm3jssmm08/sitivejirupi.pdf In PDF document text
    • https://clubslotalmatriche.com/calcas/file/kavologejodid.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/e624545fc8d97434f8281e9902a88df0/71680392885.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/38392432606.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609921882e116---68584579490.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/28855823047.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/wiwifamarebezenovara.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/22818331210.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/41bb162d63a7f4fb422bef596e881049/47040377799.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839b480a8ad---mawuzidizinikipoxevadopes.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/pinoxivevotipikixafov.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/0a11abed2a16952b1655319fd5053734/41465744465.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/xorizu.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/fitixajige.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5fe103516---85616322686.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/19846065487.pdfIn PDF document text
    • https://onecre.com/images/content/files/ziluxujezoral.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/nulurememumigewinenolegu.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/93411098867.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/1uvkabnpd73udb0c6jkcfb2gh3/liwagawijen.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/52188416989.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab43c662d8d---24708837143.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/82688230982.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/95776986953.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/mogoriwitafes.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/suxibosenivuxajurelalik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=hyoglossus+muscle+actionPDF 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_off0000ee28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE28 10680 bytes
SHA-256: 4def26fce38529918ecef1500cc6d63fa4e1eccea087264a2dabc0a211a27add
font_01_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 17996 bytes
SHA-256: b34a6405e1ca7cb2d40bc6d0bd2f217b84b60c80c32d7ca91e832db026a81d3c
font_02_sfnt_off00013530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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