Malicious PDF — malware analysis report

Static analysis result for SHA-256 d400ba3b0b794cfd…

MALICIOUS

PDF

87.7 KB Created: 2021-06-25 22:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5c6b237e14d1f30ea062a25127dccf5c SHA-1: 66128fee1de300655f6b13645ec0a674cf1be5e6 SHA-256: d400ba3b0b794cfdb3071a889a4ab8ac23c75b4b996022dba288214fcd2a9ac5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of external URIs and a link farm on disposable hosting suggests an attempt to obscure the ultimate destination of the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/648d2f03bb6abc1ffbfba10c26505914/58478355612.pdf In PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/839588f999c337a2b7bedf0603e296c3/kumenevewal.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/99076479744.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607e427e0757c---62179675278.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106091947092361.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6200cc8504---95734863826.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608297e3165a4---zakalumukipu.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/ff27092ea1761be9b5ff1369df1b3c79/96194282519.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f9ec44220---8146954089.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae674b6d27---tamumumuguninexab.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608853871e272---deboludumegumi.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160854943e5424---nojukogepajobolekilubefo.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5d6853e61---22530934589.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/634ef52a90487a5f28a12642f06a1b76/lugalesijirunodejoxodewo.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/30661320825.pdfPDF link annotation
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607543a485ea3---68900367724.pdfIn PDF document text
    • http://klefmarken.se/upload/file/jilaraxokovaxuruxa.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/40675636330.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609af5485f511---69815040583.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/27200a688db0ce621673e80a6bb4541b/29076278693.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/25d9827cad47b3ae6ce6a8653b9ab062/vuvoxabimetudegemomel.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bce7d93fe5---27031463350.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/43693861714.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/0eab943dacfa0d9946868409aefd40a7/53186029631.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/tngp3ijgb9n7otbdr3r5svgdmp/75118448282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=good+morning+have+a+beautiful+blessed+thursdayPDF 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_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 11260 bytes
SHA-256: 4efd1b3607d89ba18e56c11e8344563977f49ce7f70c70cd83da5d9e99b2f8cf
font_01_sfnt_off00010e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12692 16544 bytes
SHA-256: 20b547cbf05a08cab6043a82bd0183efe796031e77a9ed5dac49107dc1ce5fd1

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