Malicious PDF — malware analysis report

Static analysis result for SHA-256 f725f6ca8c2f1d8c…

MALICIOUS

PDF

74.5 KB Created: 2021-09-02 05:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ff2f8097a8f31f4874830277f62342b9 SHA-1: 2b54147384e73243a5bf20ef9e6491ff0bf48458 SHA-256: f725f6ca8c2f1d8ce67ac0584132cbb04f317aade7548c6464e8dc64e7a5fa15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://allytemp.ru/uplcv?utm_term=a+to+z+bhojpuri+song+2017 PDF link annotation
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/003a792c99f981d31eb703b26fd66126/lomevukesipisivosof.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/edbff3117893f100ea3884bbc1d354c0/17144735038.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609072238e350---dafomavaxelerut.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608edeec90436---97845844025.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/risaxobaxojowof.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/f98d9926cf08b421ce6d9165b9b96b5f/lotedidefolasumomojodasoz.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/birigoxusurutewodafipije.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16096757d49b91---66424095342.pdfIn PDF document text
    • https://aashianarealty.com/file/voponowejodawepozod.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/f367ff8564cbd4221ac08598d2143f2e/24502011741.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7471b3b8e---vizosubikukuf.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/adfb0d14a12e791a380ec1480825ba84/vedakupekufonuziwipebis.pdfIn PDF document text
    • https://medtek.vn/storage/file/23999878991.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b9faba02---tuvisemug.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/88246970012.pdfIn PDF document text
    • http://strandedtattoo.net/file/wufawovajasiz.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/36149973219.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/tifufolikepelalosufe.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210817174420787.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dbdf3d846ae---wewesu.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160928295c57c0---gedikapagewaramiwemiza.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/tukusimoxu.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/3354966945.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_off0000b9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BD 18040 bytes
SHA-256: f9ec04edc744b5f963c38d364c170762b64aac8f4f1bc317080f22e1fe33ac79
font_01_sfnt_off0000e8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C6 10948 bytes
SHA-256: 8f3f87d5a891fd9efdc22fa27fb4dadb785fe05a091429e76862c4954484dc3c
font_02_sfnt_off000101fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1