Malicious PDF — malware analysis report

Static analysis result for SHA-256 638665924fad7bd6…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 08:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb847b74bd76fa74ac9ee9a441b1a689 SHA-1: 45c4b63502db6e83ff46d630d1a31126953bded6 SHA-256: 638665924fad7bd6ab5b13509cf785b29e3b76f056df0443068f9a937fa5e473
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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 https://queure.ru/uplcv?utm_term=sm+j200g+flash+file PDF link annotation
    • https://myclubowners.travelenvogue.com/userfiles/files/27233943267.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/mumefepitazawodusuruneke.pdfIn PDF document text
    • http://ahchala.com/img/file/84119565489.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a060d3055---jowopaxuvizi.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/13879628714.pdfIn PDF document text
    • http://unibox.lv/files/text/26430158231.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/vemitofanevefirusibazat.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/wubemafabowazikezodol.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/56749651324.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/23fbbba6549c01c1676f423500996a8c/warenuxulorola.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/xububexu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/91277220126.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/vosutojorudake.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133c8d1e4dee---pokir.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/wozovetusuwoxunogilig.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/jupiweragatemigube.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/48261347960.pdfIn PDF document text
    • https://vigilanciaweb.cl/dinamicos/files/file/30761634825.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/14649626510.pdfIn PDF document text
    • http://rc-modeller.se/images/file///3302893114.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/14361494348.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/90f81afe8bdeca97ff64718c23eefd43/79296511497.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/14832670118.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/69837535009.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/xavepufaw.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_off0000d248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD248 10684 bytes
SHA-256: 53362f973ac068b907749e25a9ee3a747653e57e24ec163929feac493d318a77
font_01_sfnt_off0000eacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACB 18216 bytes
SHA-256: 6dc45671acb88a60625dfab8df871548f8a6311ec037c5e87e8867a25d7e48f3
font_02_sfnt_off00011a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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