Malicious PDF — malware analysis report

Static analysis result for SHA-256 e887239068c96832…

MALICIOUS

PDF

114.3 KB Created: 2021-06-25 17:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06d7cdb325a50a55ad6dc1c9109d993a SHA-1: f322574136e5887fd16c016f397537ecb8cd368f SHA-256: e887239068c96832e5d575a0243def82e79eb1a951cc15378e346717cb125d98
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://zovsh.com/Uploadfiles/files/68185231471.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835f2f8feeb---vufapaj.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852c2c1e202---siwuborosokoxuvuxodid.pdf
    • https://aashianarealty.com/file/57271357354.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/30670270089.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/c0aed969c3f149d09f4b0d465b6467b1/97278044976.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd46c10fbfd---83753209302.pdf
    • http://sklepjola.pl/userfiles/file/15457834050.pdf
    • http://ekotop.eu/userfiles/file/powajumitowuwodewa.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/fe12696609612f6cc137b6bbd2a4e116/vusobofofiluwukikagixo.pdf
    • http://studiotrusso.it/userfiles/files/ludagugivo.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b18f13a650bbfbb73eac868147b5038e/7765572843.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8088f10e8e---78400643875.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/fdd7cbd85caa7b22f530b86bc147fd95/58692326042.pdf
    • http://asesorgubernamental.com/images/file/wesovosowobepi.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/kadizenaguxi.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160806206c3d7d---kabebapuzi.pdf
    • http://dongshengcable.com/images/upload/File/81654439415.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608db8ae9d9cf---36263283427.pdf
    • http://tamker.hu/userfiles/file/sikajenibatanijezimutanaz.pdf
    • https://amitadevnani.com/userfiles/file/13839444672.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sum+of+the+zeros+of+the+cubic+polynomial
    • 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_off000154cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x154CC 16792 bytes
font_01_sfnt_off00016cde.bin
61eac8908c48bc9954ec3e73e066f3815c7bc87b4f22e09cf47ad0454327a824
pdf-font-stream PDF embedded font (sfnt) at offset 0x16CDE 19752 bytes
font_02_sfnt_off0001a025.bin
f36f351ced160060bfdb9d3415067d61964a86663ae19651b7f537c02593e3ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A025 11232 bytes