Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3789e239f0ad2e…

MALICIOUS

PDF

94.5 KB Created: 2021-07-06 00:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d56e8e20c80c7621ae67ef7735e0ad5f SHA-1: a36bba0662a768d3fa059bc1480372c1810b5e2d SHA-256: 3b3789e239f0ad2e3cfb7cc59f81ded10f6f53cdaf4fe468a463447b72764dc9
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a phishing page or a second-stage payload via the embedded JavaScript and linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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.
  • 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://barbusci.it/maisUserFile/file/77792845230.pdf In PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/42c2e41e6927c3cb258208d41ccf4a79/kukupaxegubax.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/penojegov.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cf9eaaa42---8389140094.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/99143983166.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p8l7b710kpvllav0dhhpimb9k3/85009837947.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a56dd6280f3---nafalaxonovumi.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/bb08d05eda3c6de6e54a9fcc3a8f98e7/xavigoxabonaxix.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/97711737967.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/24180354012.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/47913100567.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/af574a9f4d99da30043b0f89a3105e2a/50661405676.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/dusunajumosavoruno.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c02c435df20---37507823090.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/1ea1be1a6be2d5350f4479ff2a67e0d1/melapedifes.pdfIn PDF document text
    • http://grupophi.es/uploads/files/69638463113.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/a860b8e792adca37a191005e8d041d97/42024060503.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/897cdb7c09dd20f6bf97783ae6a3a316/80688967411.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160780205aff0a---rafumovosezu.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/be77b60dd5a858fc1900db1416630086/99276513600.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/bobozuni.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/51124522433.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851c5eda924---lakimivaviwazomep.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/potaletupopedadulu.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/debisonodokoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=read+after+we+fell+online+free+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 10452 bytes
SHA-256: 3852076cb59a43c7fd964c4d0e93f9c7d53eab7a24d1a2250d6f8d9cdc50a531
font_01_sfnt_off00010d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7B 17352 bytes
SHA-256: 9f081613c0dfd00972d523586a55e60decddb2c82dcc27e547c6329784df0db6
font_02_sfnt_off0001276b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7D 16976 bytes
SHA-256: 5359008f2e85e1df9f3adae1285c23c635b39c647bda8c814cf83ecf1c7ac234

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