Malicious PDF — malware analysis report

Static analysis result for SHA-256 55327394c22418d5…

MALICIOUS

PDF

87.5 KB Created: 2021-07-30 14:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64d4e0b5c0de4dd2cdf5f437a632c581 SHA-1: 4925ebb0855a8fef38d013ab6096de9c7d49e5d7 SHA-256: 55327394c22418d5103e932cca4d3f4e2b080f67801f39d310948b6ce52ac196
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further indicates a malicious intent to host or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://irlanc.ru/uplcv?utm_term=is+five+feet+apart+a+sad+movie
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/b3a73043ed8abfe3e8e5e8421280528a/18877123125.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c45d220296---21151120264.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/br62uf81cjfbih8a3nqla0c77f/28557689608.pdf
    • https://landi-bg.com/images/file/40636305517.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aaf1d3545---jivibagilageniboxowexatu.pdf
    • http://sieuthivatlieuhoanthien.com/upload/files/60798333642.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/0b461818e1f9c9633f523ea98d44640e/67422326931.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/samexedujovi.pdf
    • https://dunaweb.co/bg_image/files/99193239681.pdf
    • http://immobilieninvestors.eu/userfiles/file/85747568278.pdf
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/25032529896.pdf
    • https://muratay.nl/userfiles/file/fupuwegi.pdf
    • http://raegcafe.com/uploads/files/pekide.pdf
    • http://www.bash.cl/media/file/labusaxu.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/207fd92b0c8e9f8323ba41cf150574f1/75424475931.pdf
    • http://siripanyalamphun.com/user_img/files/dexigigimoxezarun.pdf
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/nuzejanefube.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/51cc116a5854c3d273069989e3c52441/regepupasifasugesuk.pdf
    • http://uekekb.ru/!upload/files/94858562559.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6fc818c65---mibibadudivesaga.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac82dc5280---42194618973.pdf
    • https://cowichanmusicfestival.com/userfiles/file/33473168636.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b56ef10d8837f8784c270c287c7b32b9/wetopimuredazavamuwo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f319.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF319 16792 bytes
font_01_sfnt_off00010b2b.bin
b2d42fb9f9d24ba493697dff891bfacfb70baf3072f546c3690f7a02d50e2c17
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2B 16632 bytes
font_02_sfnt_off0001368a.bin
bdb1fd44d0b1e5468308eae7054e0fc0975237a700a498312a74a42866786ce8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1368A 10524 bytes