Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c325d037cada78…

MALICIOUS

PDF

82.7 KB Created: 2021-08-29 11:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2130e0d814e0433a0cf274d7c9958105 SHA-1: bc8e3bcd80f498caa868dce40da765b7337da269 SHA-256: f7c325d037cada7815d8062b335fb8eab7e6ac76a4cfdf7a56763790dacd40ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) suggests an attempt to exploit PDF vulnerabilities or perform malicious actions within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://drafthe.ru/uplcv?utm_term=fifth+grave+past+the+light+pdf PDF link annotation
    • http://fosterfreezesantarosa.com/uploads/files/64105867898.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/43092304544.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/fogufujekuzoturemopisij.pdfIn PDF document text
    • https://greffedecheveux.center/upload/ckfinder/files/dodoxazidovukabujig.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/bozazegilizodabibotejidej.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cc038503a1e---57870222766.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/72134423656.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1622362444950562537.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/fojovosisuniwanovojaguza.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/5a5b817f0574541d89aa396a9621d6ca/xisozupalefolu.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/37040450330.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/8d6mr9ou4k6mp8fmdknmra8rmv/20254174777.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4e2ae640---vasadejigata.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9791f72209---21344538269.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/14851465941.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/70006813799.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/tubebuxonavupame.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/bavepigiwosepunubi.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/4krb39lb13r5hdk4780ii1buj4/38841456603.pdfIn PDF document text
    • http://accronline.com/userfiles/file/sumux.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/fumopukakololigi.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/50885217751.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/fimubesuzebulow.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/98518590228.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c627c38bcbf38aaed4ad1b9799f31baa/99447324933.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_off0000dcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC7 10596 bytes
SHA-256: 847e04c7bd5fa8e6e761c34b211c9318fd90d3f859e6563f68e7204818e9bb8b
font_01_sfnt_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 18300 bytes
SHA-256: 4bd23c9713f1c1e1e7bd7802e740cfa88c93a6126a318d0ccdb8268b4d46c1ae
font_02_sfnt_off000124b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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