Malicious PDF — malware analysis report

Static analysis result for SHA-256 903b27eb742475f6…

MALICIOUS

PDF

97.4 KB Created: 2021-08-08 04:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c4e3a5dcf8d0f5decd42764f469b724 SHA-1: 42bc0029f5537c4df20be1fd084aed52478701d7 SHA-256: 903b27eb742475f674180c3a67521e1784c9811c71455112ab82526158fc37d2
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits multiple high-severity heuristics indicating malicious intent, including random URL links and links to compromised CMS uploads, suggesting it's part of a phishing or malware distribution campaign. The presence of a 'download button' lure further supports this. Although no scripts were extracted, the overall structure and URL patterns point towards a phishing attack aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://koslita.eu/ckfinder/userfiles/files/roganososovivoxuk.pdf In PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/fjd3iijqnunh8veur7ermjm7qj/saduf.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/93afab42122645d9e6982ed2a390abdd/turetasi.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/tilisasodajajisagupaze.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/fuwixiponoduresura.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/0d36bf1359d0387014111a618f4484ce/porunuvafedijumewoxewiw.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/towubudigifogowu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160870a1af0a72---zeroduko.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/gexaluxalozesagosinetafos.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/0105f0221d5045cfdce47c9459b69f34/51132016320.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/73761132613.pdfIn PDF document text
    • http://jaht.com/userfiles/file/85320542449.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/csht6vqpvhpfugog1ud7uc5em5/44531706518.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/kumisasilok.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/06f00ef92a1fc2f46482de13da8eb340/226160351.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/vunadapo.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a57a11457c8---93630251899.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/sizojekuwugalamisupuvi.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/27871375261.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/15469030450.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/15782451898.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/sobulurevebibimuwesafu.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/94e058848b0a6fea7432ea78b38deb26/vaduxumekigutuwogosif.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210804225339.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/vitizolowogu.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/87449300330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mini+militia+unlimited+health+hack+versionPDF 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_off000115da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DA 17640 bytes
SHA-256: 2cffb24071e6bc3a35607842e1805443ebba7a99d9c24648d1f10dbd5f3f1434
font_01_sfnt_off00014436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14436 10884 bytes
SHA-256: 7d03c9e6a07cdbf1dda7dd662f5feae5d4acea2669b6afa3357ec8effe23df06
font_02_sfnt_off00015d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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