Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8022bbc2a6e1b54…

MALICIOUS

PDF

77.4 KB Created: 2021-09-02 22:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb9f00368b7af4e93dae2c80bbd2067d SHA-1: 516f0280203b715a5e58fc2b5d550b2233f86d52 SHA-256: d8022bbc2a6e1b54b4968aa4bd6c5caca1b416b2c10ac57c910a8dd24839759a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing or malware. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://nomylo.ru/uplcv?utm_term=free+nonsense+words+worksheets PDF link annotation
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f28185834---bevodixaxobog.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/wukadijetimegibujadipugo.pdfIn PDF document text
    • http://tano-cable.com/d/files/jafopuzur.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8da2ae0f3d---torivudo.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/l5c0akcp2bap7ipo5boaeeodoh/lafoganatovelitivogi.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/gajejipoxulekagulalugugot.pdfIn PDF document text
    • https://iwistw.com/upload/files/76797549663.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/d9a3bab70cb8b2f7492d86f9c8197d83/65149647709.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/fetarekizomavewaxoke.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/8k85mkjrdf6l8476ri53pt13b4/xofaposojuli.pdfIn PDF document text
    • http://punaide.com/userfiles/files/81263495086.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/7a9fff43c1319b6d780453a935c3ddf4/wajepulovobididugi.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/61726604662.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/56584045630.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/35639009217.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/66533815236.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/vawebakudid.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/61306890000.pdfIn PDF document text
    • http://nemochem.cn/upload/files/70831284550.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4880aba63---89185466888.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/2671387160.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021051204254_355275581.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202108280016004492.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///xopujexemu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f35a94db77d---tilutelazulujuped.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/tosuxabexujawuzinosisefe.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_off0000ca13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA13 18216 bytes
SHA-256: 0c08a2492a473a5dfd2c3611d2700404d86a9363bdb5aa57a2f55b74894672ba
font_01_sfnt_off0000f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11103 10200 bytes
SHA-256: 2112fcd204fd90efb1124dee60f17018456264b032ce9a017f5389dda4e81dc9

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