Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f79b1ad34f4c36…

MALICIOUS

PDF

73.7 KB Created: 2021-09-09 10:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7dfa66a79dbd8055838adda6bb2711df SHA-1: 38c5537c111215665e3aa249ac66a32bc26a11a9 SHA-256: e6f79b1ad34f4c36c5c8b21fa4f4b561fcec824af9b734a5e3cf0cc27b49a4c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The file contains a link farm pointing to various compromised websites, likely intended to trick users into downloading a secondary payload. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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://hinodecoder.com/userfiles/file/lulasaxutetoriserujuxod.pdf In PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd9505c50---26409576255.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090615520073499.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/43893275613.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/37251372774.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/meteketaruzuxitebuxag.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/74439231580.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/8833e55c31657c58297c359e19b4be4f/98123521655.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/labokizuvinagudasutukuko.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/jinival.pdfIn PDF document text
    • https://epiphanych.com/images/file/dubopusedolupojoperusuma.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/8721186756.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b3ac32995559ec486c90f598efc7b8dd/70936994519.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/56845083960.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/27451031390.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/36150930635.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/xalotamiz.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/lavesugegoxefazerof.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/xepojoderidufudigomupu.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/gibitiliruledulopogop.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/zosibejetubejajeve.pdfIn PDF document text
    • https://morabia.fi/images/file/fanijudizesututubedon.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bc252c06c---dotofudilawur.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/47020527178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pokemon+tower+defense+1+downloadPDF 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_off0000bc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC84 17236 bytes
SHA-256: 0a92eb590944ba9c222b32d4def79c4f02f9ab35e94d87a4d48945fd94c412b7
font_01_sfnt_off0000e846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 10652 bytes
SHA-256: eb7eb770888125e7f01880cd06bb42b601fa90af27e79c9078189335cd45807d
font_02_sfnt_off000100d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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