Malicious PDF — malware analysis report

Static analysis result for SHA-256 6134653232cdb90e…

MALICIOUS

PDF

91.0 KB Created: 2021-06-29 16:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 448c801fa7956665f6590f980a7cb0a7 SHA-1: a9be2408e30687eda2eae9fcdc3d7561d353108c SHA-256: 6134653232cdb90eda1063858348638d985ce24cbe117736722242b15bbb9e1c
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 upload directories, indicating a link farm designed to redirect users to potentially malicious content. ClamAV detection and ML classification strongly suggest a phishing or trojan payload is being distributed via these links. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4561c6e6b1---resejuw.pdf In PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731f7c02122---tuxiturilenef.pdfIn PDF document text
    • http://mebco.ru/images/file/24759346642.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/m23j8c8ksuqhhjtjgb7k6135r8/jazexegezisemex.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/43191239195.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ab067ef66c80fc9c3a6f739923a2c2da/levifezefulanoxajudanigi.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607048dd6bf0f---60127163470.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa64ad72601---15188203605.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af99def305c---82437931156.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/wowisusujuvisodesazibikux.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/21215500609.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/7853984412.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a762df4b357---sukaxelan.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f212d0e7ff---gowuwodikaxe.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/5d55963eb1306d2ae839352b4ed5f27c/pononidunodozefixadumofum.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/10015174793.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2ccdda152a409681bf60e423d8c6ade8/jitomixubegajotixo.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084ee2e3fda2---potojumud.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/18i5gjuqfdmaei8441emsrbrrg/1707620375.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/84477039903.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/vufowaxut.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/0d1620eb0ea5a84fe556d5ead5d5ce6f/34563252787.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cefe949cd9---80574124748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=love+red+quotesPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010137.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10137 17552 bytes
SHA-256: 5544a5432d86b22bf48de38a22a7dd813aba0570578e2056518d3648ab90246f
font_00_sfnt_off0000eabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABF 10108 bytes
SHA-256: bd9bfb43559f7ba10229645214fa6b4b9d11c7a3383ba3ef5eea0d58b016a79f
font_02_sfnt_off00012f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F24 16376 bytes
SHA-256: c0ce40a0db5da46198e8a330e54b405f016c0121b1c9e2ed55fd47191f7d331c
font_03_sfnt_off00014566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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