Malicious PDF — malware analysis report

Static analysis result for SHA-256 a215ac9b564f910a…

MALICIOUS

PDF

82.3 KB Created: 2021-10-05 20:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b55a8887798e831d83efd1a0b18a6032 SHA-1: ba6477cd997bba008411962b7a58566114fe469e SHA-256: a215ac9b564f910a5491fbef214147cdcf4e2d70ed52b3965325b23b0c7eb7c5
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The presence of a link to a WordPress upload storage suggests an attempt to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://iwistw.com/upload/files/53848598682.pdf In PDF document text
    • https://banderlogclub.ru/Files/file/6030145634.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/zonatalilevoxi.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/81956440444.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/gegid.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/tipijasojukiwafotomonuma.pdfIn PDF document text
    • https://bdata.vn/upload/files/lizutifunugaworamole.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/napajitunivaxofamadowaxax.pdfIn PDF document text
    • http://specialcats.nl/media/files/54446011487.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3cb30a64a---82241288298.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/95059342735.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/widojelabulodilew.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/nt7tfsd8dhiopi7oh7csvd57d1/xalugugixasejafena.pdfIn PDF document text
    • http://getdol.com/page_data/file/zatijavakukufuseluf.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/52254706866.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/pesakoj.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/vusemixepopuxorat.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a17899a53---93947781356.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459efc62681---fedapefidewedimafe.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/78444459238.pdfIn PDF document text
    • http://cripper.de/media/zaper.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/63792355389.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/25388677560.pdfIn PDF document text
    • http://runo34.ru/attachments/file/gugalibug.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/4934546280.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/tosopirekafolujaxefipomux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=discount+formula+in+profit+and+lossPDF 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_off0000d4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A6 10748 bytes
SHA-256: 50d2e7561eaefa3d5acab22a177a4477a92d348367cd40bd73a4d75b09fc81e5
font_01_sfnt_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 20536 bytes
SHA-256: f373fecacaa721cf67f06994896dfc7d37e8324bde7c7277b50954c1dbbe7958
font_02_sfnt_off0001233a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1