Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19febc8339e6cf4…

MALICIOUS

PDF

80.8 KB Created: 2021-08-15 01:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 47daed38360c179bf4399d02c5a649ea SHA-1: e0c05e4629bb25a27738c1e2ae8ea0ca86c03cce SHA-256: d19febc8339e6cf4aaa9a7f11694dc6387c8612b73a9821941b6f4c4b4e7abb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, redirecting users to potentially compromised websites or phishing pages. The presence of multiple external URIs and link farm heuristics suggests an attempt to lure users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://wastran.ru/uplcv?utm_term=best+dunkin+donuts+iced+coffee+order+reddit PDF link annotation
    • http://bkdesign.ee/userfiles/file/durorivobavowasofaziruda.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/sesafugil.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/vorogobezifesapafed.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/4502465758.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/19rk5q3uelkob9cfn76ejdci16/siwoluropuzokazapinijud.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28c828b391---sizugiwositabegin.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/89942827066.pdfIn PDF document text
    • http://schokozentrale.de/idata/vofaxatatutulosifasivivu.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082b73e78dcf---najigavapibiragenifupa.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28246e2b4a---94960437746.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160894c57a8803---73656838292.pdfIn PDF document text
    • http://learningkey.org/userfiles/kejemulejofemabetud.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/tinuzovobavogaxil.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/86473193270.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/39393424425.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a2bb09be3---18124717593.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16082ae477f4ee---zuzekukijamawajogudow.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/labevobegelesilugulu.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/16030657021.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/kci05mtgmc3pn8soug7ro88rqf/kuxinosodibasulexosazoz.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093f8aa58283---87094689375.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/fed91d7cef0bb47807c625f6df4c382a/96962428958.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DD 16416 bytes
SHA-256: a8d1e34bf444334761db8dd673e30599a677bf9ec537d4b136fd145dfe542046
font_01_sfnt_off0000dc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4E 10504 bytes
SHA-256: 78fcc6eb456ad113d3de5023b21dfc24a33bb7761028771affbacdad4270aee7
font_02_sfnt_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C72 15428 bytes
SHA-256: c1898158e8ff20c3914ba71846d01bc1a6f8f35cae77a5427a2cea598ef650ab

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