Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d5c3884da45b7b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-11 08:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 078e0978fe470b35df2365bdc4bc918e SHA-1: 458251cc0354c9763d2826ea12d9dea08fa1bbdc SHA-256: b8d5c3884da45b7b40a655e593969376535fd544104bddbaac7fd0e22bbbca63
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The document body is unreadable, but the presence of numerous links suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://kanchanaspa.com/ckfinder/userfiles/files/34916277074.pdf In PDF document text
    • https://datatech-int.com/userfiles/file/zorabudid.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/18510609972.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/upljt85c29332560h0l779572q/nitubojodanu.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/lapatewamimatefew.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/zugazugibikinarusenokor.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/gofifese.pdfIn PDF document text
    • https://svltv.in/userfiles/files/36522732123.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/vufifafoxen.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613702e8c9622---94993383354.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/sujisemupasi.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16131395643ba3---6332516172.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/refizokiz.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16132563230ffb---65803574128.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/zetudifoki.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/ropizubujuvijikanatesalu.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/tuzubebefapo.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/35767742068.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/kisibagu.pdfIn PDF document text
    • http://elskenecologie.nl/files/kovukinurewebekivan.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/sijujoxiraso.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/xowiwitenelawesilevo.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/juraxomemaraxuvigovekipi.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/89943407162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=dream+league+soccer+2020+apk+iosPDF 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_off0000df06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF06 18092 bytes
SHA-256: a2f300f6aea2838a633d3ff1216f579c0d5166f02e7df5248c506a0df337b56d
font_01_sfnt_off00010e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E17 10952 bytes
SHA-256: 16c566734f1dbe7e57700ad03ee7ffa310ad367a2058eee3a871e23d284a9359
font_02_sfnt_off0001278a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1