Malicious PDF — malware analysis report

Static analysis result for SHA-256 403c712b4cedca1a…

MALICIOUS

PDF

74.6 KB Created: 2021-09-12 23:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 85cd45ac9ab6caac19facfdbf7e82b43 SHA-1: b0830a123199abccdce3a9222ca53ccb019ff9e7 SHA-256: 403c712b4cedca1ac74db66e3f961c80d890cfe14cfacbf1d286398d41c35835
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to other PDF files hosted on disposable or compromised domains. This structure strongly suggests a link farm designed to lure users into downloading further malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://clair-environnement.eu/catalogue_dynamique/file/18799806675.pdf In PDF document text
    • http://factorycontrolprojects.com/userfiles/file/jumukuli.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/xujazew.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/20153862892.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d20692c1d6---16154417698.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/tebatalavuxurotafut.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/65729808048.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/6clidhafn10blad7v7phqm8ib2/jidasazunenegabepak.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/0dca6f85b555030693d95e2eb2baccb9/33105038537.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/vosikufifuwezamaweguvuzi.pdfIn PDF document text
    • https://remini.hu/userfiles/file/76847976765.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/71993210803.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/rafibajekomusapib.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/77420337963.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/16308777637.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/doditadesogix.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/91377250969.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613ce590c1446.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/nurivivemetexalemizunuj.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/98879993463.pdfIn PDF document text
    • http://hzqzg.com/d/files/wejixotuwukagamikobuwasow.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/21812153317.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/7f007cc9800c7a4d2af0bea00d82f2d4/84629943439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=graffiti+throw+upPDF 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_off0000c233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC233 10228 bytes
SHA-256: f30f2131f239596a929182f7be84d82e18934cb07dd272522233f358a5ba7169
font_01_sfnt_off0000d95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 17068 bytes
SHA-256: f560bb4830858ff1da7b4d486eccfea960f355fc9644d51245ed81ff631be42f
font_02_sfnt_off0001055b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1