Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab62e5cd7068eeaa…

MALICIOUS

PDF

93.3 KB Created: 2021-07-08 01:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fa2bc6142cc8b542454d56b8f5e5566d SHA-1: 870da0c4fb0a1795f047f6663c4e572c8c2fc9a7 SHA-256: ab62e5cd7068eeaabd41dbfdbb1c825ce050fcf8b48896b209506c687d8d057d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dighakanchaninternational.com/FCKeditor/file/vutomunenumelubiselozaj.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8srd9h2j9941orvv46767l6897/93800476247.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a240c6070b1---37758305528.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/kawifesejejuvuz.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2219040c08336a4a9ac8f8d1c26ccfc6/magenopavawofaxa.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1bdf985f8---49646926735.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a84a826192b---geruwaratukopowobamadofox.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/hdjrh98n5ouf8r0h33debal301/josavomagive.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/2665052534.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3acbc30a35---gelosuzanitube.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/096sfvvvooqpj7dk875i3n13cv/rogax.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/31482412590.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/25127697693.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/d3b90261e5589fa015b480a0089ce84d/nigumetarivasovu.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097ffe88fda6---94211621207.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/mufagifujasa.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8502089461---86618834172.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/detudel.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bef498ba6---91218234188.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/h3e57rrlsm1pvbn9oke49lm6g7/xobez.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/46852426092.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e450ee83f70---girox.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a976c3a0cdc---20488509917.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/tuvegizoforeb.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/hvom1m9g1uq2k7m7v1lefackpk/pemekoxuviweromupob.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/lubum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=advantages+and+disadvantages+of+nanotechnology+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093017120d9e---fodosupazexuvewaxopalaga.pdfIn PDF document text
    • 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_off00010a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12259 16724 bytes
SHA-256: 54ae78c31f34e58c3db82c2dfefbdcd3ca12aca3c910b62b86f37ae824ce520c
font_02_sfnt_off00014de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE1 10960 bytes
SHA-256: 282425c82bc8e8fae14d28e308043801f5a674d515e56b14d9300a5c973612cd

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