Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fa123c20d0a4c6…

MALICIOUS

PDF

77.8 KB Created: 2021-06-29 02:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 234177f7667aed9e8d36f33bc2a03f03 SHA-1: 8aa101487817f22e06a5cdd895c4975db02b9043 SHA-256: a4fa123c20d0a4c681f1038e41a280f10f00fa97dc790d3749fc949f57608e05
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a common tactic of using documents to funnel users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://speculatio.in/ci/userfiles/files/kalavuxolurenibi.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/a1eec46fd69b786b75ad2eba8859bb61/72714373477.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c997bb8dbc4---97574895815.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/541154531fd931c5843416a7660e4010/xodonoxetizawadu.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/3nombor04i0qtgbf6191clv8rf/pabozulapixodixex.pdf
    • https://arvikabc.com/images/uploadedimages/file/45610857469.pdf
    • http://onnetsolution.in/userfiles/file/dusedotilegesotoj.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9aed7c305---xinuzajap.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/67fe59be2fb019345a06616197e5ccfa/dojirotokelidiwimom.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/7b5345ab9e37151a9005734120d7d5d5/xizilunovawaz.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2f1e021b---xatewixi.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083ac1e9b080---65895987660.pdf
    • https://geneticapanama.com/userfiles/file/59991977985.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745cec320fe---wefefe.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d82df6a1dd8---tufuf.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe08df0eb5---48890348723.pdf
    • http://valdhans.cz/userfiles/file/27126053049.pdf
    • https://ikitellirezistans.com/upload/files/18645646498.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae85383ea9---98196148482.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc84aa7119---meruxewir.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/373476bedaaaf246db3eabdeadb55ba2/mivekenotodinetese.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072a54b8c868---kakemep.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160abfb7fc9338---kutirama.pdf
    • http://aucoindeshalles.com/menu/file/79445079445.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=settlement+meaning+in+tamil
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c723.bin
dec2d623d3863080c0a00f3b04c4eec261eb0de2d2a04e787e7fc63eaa76b7dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC723 19628 bytes
font_01_sfnt_off0000f94d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF94D 16792 bytes
font_02_sfnt_off00011164.bin
6807213281d6510285384e1575e4be2fbd87ca76b6c159fedb9e0dc3ae4c56bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11164 10136 bytes

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